Configure: STEIGER DYNAMICS IKON™ Pure IKON is designed to provide quiet operation in small spaces like living room cabinets (horizontal placement) and small desks (upright placement). IKON Pure features lossless bitstreamed audio and video up to 4K/60p through HDMI 2.0b with HDCP 2.2, HDR10, Dolby Vision, WCG, Hybrid Log Gamma, and Dynamic Metadata compatibility. It furthermore boasts plenty of processing power for audio and video upsampling and fully replaces a desktop PC. The system complies with standard PC specifications and is fully upgradable at any time. Please do not hesitate to contact us for help with your system configuration from one of our engineers by phone (1-855-915-9000), Live Chat, or email. Base Price: Customized Price: The STEIGER DYNAMICS Experience We guarantee a no-compromise approach when it comes to system performance, quality, reliability and quietness. This is made possible by strictly abiding by our SD Experience rules: Customer First, No Upselling: Nobody at SD receives sales commission.The experts assembling your system will also provide support when needed. Like to use a component that is not listed below? Let us know. - Nothing But The Best: We pursue a no-compromise approach in all respects. We only integrate carefully selected best-in-category components, ensuring ultimate performance, realiability and quietness. - Assembly Excellence: Each system is assembled with ingenious passion and unparalleled attention to detail. Our uncompromising standards minimize the risk of defects and assure immaculate looks. - Premium Quality Assurance: Every detail of our systems is carefully scrutinized and perfected. Our strict 72-hour stress-testing and benchmarking ensures rock solid stable operation, overclocked or not. - Maximum Privacy, No Bloatware: We do not preinstall any Bloatware, i.e. third party software that could potentially slow down your computer. We also set Windows privacy settings to maximum. - Plug & Play Ready: Windows is updated, optimized with specific settings and the latest drivers for your components. All that's left to do is to connect your Steiger system to a TV or monitor, turn it on, and frolic. - Full Upgradability: What to do in a few years when the latest games require more horsepower? Based on ATX/PCI standards, our systems can be upgraded at any point in time without losing your warranty. - Secure Shipping: We pack our systems in rigid dual-layer carton boxes with custom-sized foam inlays. Depending on the configuration, we also use innovative self-expanding foam to protect the valuable interior. - 4K Ultra HD Blu-ray Edition Please choose this option to enable 4K/UHD Blu-ray disc playback capability for your configuration. This will restrict some of the options below, including the use of a dedicated graphics card. 4K UHD Blu-ray Edition : Automatic component selection below, Win 10 optimization, Blu-ray Software pre-installation None Specials Find our current promotions here. Check the box to activate them. FREE 6ft 4K/60p-capable HDMI cable - FREE Continental US Ground Shipping <|> FREE International Expedited Shipping On Orders Over $5,000 (some restrictions apply) - FREE 'Kill All Zombies' Single Screen Co-op game with any NVIDIA graphics card - FREE upgrade to Thermal Grizzly CPU Premium Thermal Compound - IKON B-Stock chassis - $30 OFF (New, with minor imperfections) - Motherboard We only use motherboards from world-leading brands ASUS and ASRock. Models were selected for maximum reliability and endurance. They are guaranteed to include the features mentioned in the description (or more). Please contact us if you require a specific motherboard not offered in our configurator. Intel H310 Chipset, mITX, 6x USB 2.0/3.1, Dual-Band WiFi ac / BT4.2, Intel Gigabit LAN Intel H370 Chipset, mITX, 10x USB 2.0/3.1Gen1+2, Dual-Band WiFi ac / BT4.2, Dual Intel Gigabit LAN Intel Z370 Chipset, mITX, 10x USB 2.0/3.1, Dual-Band WiFi ac / BT4.2, Dual Intel Gigabit LAN, DDR4 3000+ support Intel Z390 Chipset, mITX, 10x USB 2.0/3.1Gen2/C, Dual-Band Intel WiFi ac / BT4.2, Dual Intel Gigabit LAN, DDR4 3000+ support Intel Z390 Chipset, mITX, 9x USB 3.1Gen1+2/C/Thunderbolt3, Dual-Band Intel 2x2 WiFi ac / BT 5.0, Intel Gigabit LAN, HDMI 2.0/HDR/HDCP2.2, 3.5mm 120dB SNR DAC with NE5532 Premium Headset Amplifier (Supports up to 600 Ohm headsets), Optical SPDIF, DDR4 3000+ support Processor Get a smooth, seamless visual experience and highest energy efficiency with an Intel® processor. "K"-CPU required for overclocking. Intel Pentium Gold G5400 8th Gen - Dual-Core, 4-Thread, 3.7 GHz, 4 MB Cache, UHD 610 Graphics Intel Pentium Gold G5600 8th Gen - Dual-Core, 4-Thread, 3.9 GHz, 4 MB Cache, UHD 630 Graphics Intel Core i3-8100 8th Gen - 4-Core, 3.6 GHz Turbo, 6 MB Cache, UHD 630 Graphics Intel Core i3-8350K 8th Gen - 4-Core, 4.0 GHz Turbo, 8 MB Cache, UHD 630 Graphics Intel Core i5-9400 9th Gen - 6-Core, 2.9 / 4.1 GHz Turbo, 9 MB Cache, UHD 630 Graphics Intel Core i5-9600K 9th Gen - 6-Core/6-Thread, 3.7 / 4.5 GHz Turbo, 9 MB Cache, UHD 630 Graphics Intel Core i5-9600K 9th Gen - 6-Core/6-Thread, overclocked to 5.0 GHz , 9 MB Cache, UHD 630 Graphics Intel Core i7-9700K 9th Gen - 8-Core/8-Thread, 3.6 / 4.9 GHz Turbo, 12 MB Cache, UHD 630 Graphics Memory All memory modules we use are from industry-leading brands and are being fully stress and stability tested at their respective speeds. Memory with speeds higher than 2666 require Z- or X-chipset motherboards.We typically do not offer memory speeds higher than 3000 due to diminishing performance benefits and additional strain on the CPU-integrated memory controller which directly translates into heat (and noise). 8 GB (2 x 4GB) 2666 MHz DDR4, Dual-Channel 8 GB (2 x 4GB) 3000 MHz DDR4, Dual-Channel 16 GB (2 x 8GB) 2666 MHz DDR4, Dual-Channel 16 GB (2 x 8GB) 3000 MHz DDR4, Dual-Channel 32 GB (2 x 16 GB) 2666 MHz DDR4, Dual-Channel 32 GB (2 x 16 GB) 3000 MHz DDR4, Dual-Channel Graphics Card NVIDIA GeForce graphics cards deliver outstanding performance and support the latest gaming technologies as well as 4K/UHD resolutions (@60 Hz through HDMI 2.0 or DisplayPort) and playback and allow real-time video up-sampling in JRiver Media Center. HDMI 2.0 with Intel UHD graphics requires the respective motherboard selected above. Intel iGPU Pro HD / UHD Graphics (HDMI 2.0 4K/60p with respective motherboard selected above) NVIDIA GeForce GT 1030 - 2 GB, HDMI 2.0b, HDR10, HDCP 2.2, passive cooling / silent NVIDIA GeForce GTX 1050 (recommended for Jriver MadVR video upsampling) - 2 GB, HDMI 2.0b, DP 1.4, HDR10, HDCP 2.2, silent in idle Audio We recommend to connect your STEIGER DYNAMICS HTPC via HDMI through the Audio/Video Receiver (AVR) to the TV. This allows the enjoyment of lossless bitstreamed HD Audio®, Dolby TrueHD™, Dolby ATMOS, DTS Master Audio, and DTS:X (7.1 or higher, also possible with DVI or DisplayPort). Alternative ways include a direct connection to the TV or to any external Audio system (native 5.1/upmixed 7.1 surround sound via optical S/PDIF or analog audio jack (to RCA)). We also offer additional dedicated sound cards for high-end analog or studio usage. Switching between sound outputs can be done in Windows or in supported players. We recommend: - Included 7.1 Dolby TrueHD / dts-HD lossless bitstreamed digital surround sound via HDMI (or DVI / DP) for gaming and entertainment enthusiasts - EVGA NU Audio 2.1 (analog) / 5.1 (optical S/PDIF) with AK4493 DAC, Headphone Amp (16-600ohm), 123dB SNR, up to 384kHz, 32bit playback, switchable OP-AMPs, line/mic-in (up to 384kHz, 32bit, 121dB SNR recording) - ASUS Essence STX II 7.1 for analog surround sound audiophiles - RME HDSPe AES with DB25 connector for multi-channel studio professionals HDMI lossless bitstreaming (multi-channel / ATMOS), front and rear HD Audio Jacks / optical S/PDIF EVGA NU Audio 2.1 (analog) / 5.1 (optical S/PDIF) with AK4493 DAC, Headphone Amp (16-600ohm), 123dB SNR, up to 384kHz, 32bit playback, switchable OP-AMPs, line/mic-in (up to 384kHz, 32bit, 121dB SNR recording) ASUS Essence STX II 7.1 analog 124 dB SNR (RCA out (7.1), 6.3 mm Jack in, Headphone Amp, S/PDIF out, swappable Op-Amps). Does not support object-based audio like Atmos or DTS:X. RME HDSPe AES Professional Sound Card - 32 Channel 192 kHz AES/EBU PCI Express - D-Sub 25 TASCAM (does not support object-based audio like Atmos or DTS:X) System Drive (for Windows/Apps/Documents/Games) The System Drive SSD will contain the Operating System (OS) and applications. If the system is used for gaming or to store media, we recommend 500+ GB or an additional storage drive (configurable below). 120 GB WD Green M.2 SSD, (read/write speed (MB/s): 500+/400+), silent 240 GB WD Green M.2 SSD, (read/write speed (MB/s): 540+/430+), silent 250 GB WD Black NVMe SSD (read/write speed (MB/s): 3000/1600), silent 250 GB Samsung 970 EVO Plus NVMe SSD (read/write speed (MB/s): 3400/1500), silent 512 GB Intel 660p NVMe SSD (read/write speed (MB/s): 1500/1000), silent 500 GB WD Black NVMe SSD (read/write speed (MB/s): 3400/2500), silent 500 GB Samsung 960 EVO NVMe SSD (read/write speed (MB/s): 3200/1800), silent 500 GB Samsung 970 EVO Plus NVMe SSD (read/write speed (MB/s): 3400/2300), silent 512 GB Samsung 970 PRO NVMe SSD (read/write speed (MB/s): 3500/2300), maximum endurance, silent 1000 GB WD Blue M.2 SSD, (read/write speed (MB/s): 560/530), silent 1024 GB Intel 660p NVMe SSD (read/write speed (MB/s): 1800/1800), silent 1000 GB Samsung 970 EVO Plus NVMe SSD (read/write speed (MB/s): 3400/2500), silent 1024 GB Samsung 970 PRO NVMe SSD (read/write speed (MB/s): 3500/2700), maximum endurance, silent 2048 GB Intel 660p NVMe SSD, (read/write speed (MB/s): 1800/1800), silent 2000 GB Samsung 970 EVO NVMe SSD (read/write speed (MB/s): 3500/2500), silent Storage Drive(s) (for Media/Games/Apps/Documents) Max 2x 2.5" HDD or SSDs in addition to the system drive selected above. Max 1x additional regular HDD if no dedicated graphics card selected. The Storage Drive stores all your music, movie libraries, & TV recordings and backs up your personal data from the SSD System Drive. We recommend: - HDDs for large movie/music libraries (WD Red drives are silent, power efficient, cool, and hence ideal for 24/7 media servers; 1,000 GB = 100 Full HD movies or 300k MP3s) - SSDs for media editing/encoding (SSDs are 100% quiet and up to 5x faster than HDDs) - SSDs for potential RAID configuration 1000 GB Samsung 860 EVO SATA SSD (read/write speed (MB/s): 550/520), silent 1000 GB SD-approved SATA SSD, (read/write speed (MB/s): 550+/500+), silent 1024 GB Samsung 860 Pro SATA SSD (read/write speed (MB/s): 560/530), maximum endurance, silent 10TB WD Red HDD, 5400 rpm, ultra-quiet 10TB WD Red PRO HDD, 7200 rpm 14TB Seagate Ironwolf HDD, 7200 rpm 1TB Seagate Barracuda HDD 2.5", 7200 rpm, ultra-quiet 1TB Seagate Firecuda SSHD 2.5", 7200 rpm Flash-accelerated, ultra-quiet 1TB WD Black HDD, 7200 rpm 1TB WD Red HDD, 5400 rpm, ultra-quiet 2000 GB Samsung 860 EVO SATA SSD (read/write speed (MB/s): 550/520), silent 2000 GB SD-approved SATA SSD, (read/write speed (MB/s): 520+/500+), silent 2048 GB Samsung 860 Pro SATA SSD (read/write speed (MB/s): 560/530), maximum endurance, silent 2TB Seagate Barracuda HDD 2.5", 5400 rpm, ultra-quiet 2TB Seagate Firecuda SSHD 2.5", 7200 rpm Flash-accelerated, ultra-quiet 2TB WD Black HDD, 7200 rpm 2TB WD Red HDD, 5400 rpm, ultra-quiet 3TB WD Red HDD, 5400 rpm, ultra-quiet 4000 GB Samsung 860 EVO SATA SSD (read/write speed (MB/s): 550/520), silent 4096 GB Samsung 860 Pro SATA SSD (read/write speed (MB/s): 560/530), maximum endurance, silent 480 GB SD-approved SATA SSD, (read/write speed (MB/s): 500+/400+), silent 4TB WD Red HDD, 5400 rpm, ultra-quiet 4TB WD Red Pro HDD, 7200 rpm 500 GB Samsung 860 EVO SATA SSD (read/write speed (MB/s): 550/520), silent 512 GB Samsung 860 Pro SATA SSD (read/write speed (MB/s): 560/530), maximum endurance, silent 6TB WD Red HDD, 5400 rpm, ultra-quiet 6TB WD Red Pro HDD, 7200 rpm 8TB WD Red HDD, 5400 rpm, ultra-quiet 8TB WD Red PRO HDD, 7200 rpm Intel Optane 16GB M.2 Flash HDD Accelerator (improves read/write speeds of HDDs (not SSDs) Intel Optane 32GB M.2 Flash HDD Accelerator (improves read/write speeds of HDDs (not SSDs) None Optical Drive Optical drives do not come bundled with playback software for physical Blu-ray discs unless specified. We recommend selecting CyberLink PowerDVD in the software section further down below to enable Blu-ray disc playback. 8X External USB DVD/RW Combo - Reads and Writes to DVD/RW(8x)/CD(16x) 6X External USB Blu-ray Disc Re-writer - Reads and Writes to BD (6x)/DVD(8x)/CD(24x) 6X External USB 4K/UHD Blu-ray Disc Re-writer - Reads and Writes to BD (6x)/DVD(8x)/CD(24x), including PowerDVD 14 UHD None TV Tuner Choosing a TV tuner enables your system to replace your DVR for Over-The-Air (OTA) TV. Watch TV and record in Plex (Plex Pass required), Kodi (Plugin required) or JRiver. USB TV tuner required if a dedicated graphics card is selected above. DigitalNow VistaView Dual Hybrid (7164) DVB-T and Analogue PCIe TV Tuner (Australian version) Hauppauge HVR-5525 PCIe PAL DVB-S/S2, DVB-T/T2, DVB-C (European Version), WinTV 8 Hauppauge WinTV-HVR-955Q External USB NTSC/ATSC/QAM digital and analog TV Tuner with audio/video component inputs (works with Plex DVR) TBS6680 DVB-C Dual Tuner Dual CI PCIe TV Tuner (European PAL version) Hauppauge WinTV-HVR-1265 Internal QAM, ATSC, NTSC TV Tuner, WinTV 8 (US Version) None Connectivity Your STEIGER DYNAMICS living room PC features all important connection options as standard. The chassis features front panel HD Audio and USB 3.0 connectors. Back panel connectors vary depending on your selected motherboard and graphics card. Additional Wireless options can be configured below. Front Panel - 2x USB 3.0/3.1 Gen1, HD Audio In/Out - Netgear A6200 dual Band Wi-Fi 802.11ac USB dongle with antenna (up to 1200 Mbps), with Beamforming+ - Back Panel - USB, Audio, Display and Network connectors. See motherboard and graphics card description for details. - Integrated Wi-Fi/Bluetooth 802.11ac 2.4/5.0 GHz / BT 4 LE with antennas - Power Supply All our Power Supply Units (PSU) operate from 110-240V and can be used worldwide. PSUs with higher output capacity and/or Gold standard stay cooler, more efficient and more silent on high system loads. - 450 Watt PSU required for system configurations with a GTX 970 graphics card or higher 300 Watt SFX Power Supply, ultra-quiet 450 Watt SFX Power Supply, ultra-quiet 550 Watt SFX Power Supply, Gold efficiency, ultra-quiet 600 Watt SFX Power Supply, Gold efficiency, ultra-quiet Cooling All cooling solutions feature temperature-dependent, variable fans. Fan curves are adjusted by us for each individual system and trimmed towards maximum quietness, while keeping all temperatures well within specs. We recommend the large air cooler for maximum quietness under idle and load. Required for i5 and i7 "K" CPUs. Quiet Stock Aluminum Air Cooler with temperature-sensitive variable fan Ultra-quiet STEIGER large heat-pipe Air Cooler with temperature-sensitive variable 140 mm fan Operating System Please select your preferred edition of Windows. We recommend Windows 10 for most use cases. Windows 10 Pro provides additional features like receiving Remote Desktop Connections, file encryption, and domain participation. Windows 8.1 Pro with Media Center supports the use of Cable TV Tuner cards and enables Live TV functionality, fully replacing your DVR. If you would like an operating system language other than English, please specify your preference in the comment field at the bottom of this page. Microsoft Windows 10 - 64-Bit, maximum privacy settings enabled Microsoft Windows 10 Professional - 64-Bit, maximum privacy settings enabled. (Includes optional BitLocker which requires selection of TPM module below) Media Center/Player Please select your Media Center / Player of choice below. A Media Center is an optional interface in Windows which allows you to comfortable play and manage your media files, including movies, music, photos, live TV, streaming channels and more. In addition, all Media Centers support phone/tablet control (iOS, Android, Windows Phone) and programmable remote controls like Logitech Harmony. We recommend: - JRiver Media Center or MPC-HC player with MadVR plugin for ultimate hardware-based video and audio rendering quality. JRiver also supports Over-The-Air (OTA) and non-encrypted cable live TV. - Kodi Media Center (former XBMC) provides the highest configurability and plugin support - Plex Home Theater / Server is the most easy-to-use Media Center and allows pre-configured streaming to mobile devices. Plex does not support additional plugins. JRiver Media Center (V25, full Windows license) with MadVR video renderer plugin, installation and configuration - KODI Media Center (former XBMC), installation and configuration - Media Center boot option - have your system boot directly into your Media Center of choice. Please specify in the comment section at the bottom if you picked more than one Media Center - MPC-HC light Video/Audio Player with MadVR video renderer plugin installation and configuration - PLEX Media Server / Media Player installation and configuration - play your media files on any device anywhere, AirPlay support - Couchmaster Lapdesk The COUCHMASTER is an innovative, European-handmade lapdesk for mouse and keyboard usage, bringing the desktop PC experience to your living room. It is the perfect support equipment for long, comfortable gaming sessions and for ergonomic working on your living room TV. Two large support cushions, covered in faux leather, carry your forearms optimally while the crossboard holds all mice, keyboards, and accessories. The Pro version comes with a USB extension cord and integrated USB 3.0 hub, which provides connections for up to 4 USB devices (e.g. mouse, keyboard, headset, USB charger, etc.). Latest chip and cable technology makes it possible to operate the hub and devices without a dedicated power cable. COUCHMASTER Basic includes the following parts and accessories: - Sturdy, lightweight faux leather covered wooden crossboard (34x12x1.5 in or 85x30x4 cm) - 2 faux leather covered side support cushions (24x10x7 in or 60x25x18 cm) - 2 wrist pads, faux leather - 8 ft of Velcro to affix wrist pads and gaming equipment to the crossboard COUCHMASTER Pro includes the following parts and accessories: - Sturdy, lightweight plastic crossboard with integrated cable management solutions (34x12x1.5 in or 85x30x4 cm) - 2 faux leather covered side support cushions (24x10x7 in or 60x25x18 cm) - 3 wrist pads, faux leather - 8 ft of Velcro to affix wrist pads and gaming equipment to the crossboard - USB 3.0 Hub with 4 Ports (max 900 mA, no dedicated power cable required) - 16 ft (5 m) Active USB 3.0 Extension Cable (black) Price is including shipping cost. COUCHMASTER Cycon - full set with armrests/cushions - black - 4-port USB 3.0 Hub, 16 ft active USB 3.0 cable None Mouse & Keyboard There are multiple ways to control your STEIGER DYNAMICS Home Theater PC. There is a wide variation of Smartphone and Tablet Remote Control Apps like Splashtop or Microsoft Remote Control. For Media Center and regular PC usage, we recommend the Logitech K830 Keyboard/Touchpad combo.For serious gaming or working from the couch, we recommend wired or wireless Mouse & Keyboard with a hard mousepad, either directly from the sofa and lap or with the COUCHMASTER above. ROCCAT mice and keyboards are extremely precise and perfectly suited for gaming and work. For wireless operation, we highly recommend the Logitech devices listed below. EVGA TORQ X10 USB Wired Gaming Mouse, 1000 Hz, 8200 dpi - Logitech G502 Proteus Spectrum Gaming Mouse - Logitech G910 Orion Spark Mechanical RGB Gaming Keyboard - Logitech K740 Illuminated Keyboard - ROCCAT Alumic - Double-Sided Gaming Mousepad - Hard & Solid, Black, Coated Aluminum - Roccat Kone EMP Max Performance RGB Gaming Mouse - Roccat Suora Mechanical Illuminated Gaming Keyboard - ROCCAT Hiro+ - 3D Supremacy Surface Gaming Mousepad - Soft, Black, Vulcanized Silicone - Logitech K800 Wireless Illuminated Long-Range Keyboard - Logitech K830 Wireless, Illuminated Long-Range Keyboard with Touchpad - Other Peripherals Complement your living room computing experience with useful peripherals. Adapter: Microsoft Xbox Wireless USB Adapter for Windows 10 (required to connect up to 8 Xbox One Wireless Controllers) - Gamepad: Microsoft Xbox One Wireless Controller for Windows 10 - Black - Gamepad: Microsoft Xbox One Wireless Controller for Windows 10 - White - Headet: Creative Sound BlasterX H7 Tournament Edition HD 7.1 Surround Sound USB Gaming Headset - Headet: HyperX Cloud Revolver S Stereo (7.1 emulated) USB headset with microphone - Webcam: Logitech C615 HD Webcam with Echo cancellation (recommended for living room setups). - Gamepad: Microsoft XBOX 360 Wireless Controller(s) for Windows - Black (includes Wireless USB Adapter) - Webcam: Logitech C922 Pro Stream Webcam with Background Replacement Technology for YouTube or Twitch Streaming - Accessories Every STEIGER DYNAMICS system comes with complimentary accessories to ensure plug & play experience and to keep all included spare parts and documents in one place. ASUS Trusted Platform Module (TPM), required for Bitlocker - Digital HD Indoor Antenna (coax) with Amplifier (USB powered). Requires TV card selected above. - High Quality HDMI Cable - 10ft (3m), black, Double Shielded, Gold Coated Plugs, HDMI High Speed for lossless Audio, 3D Video, up to 4K/60p resolution - Active USB 3.0 Extension Cable - 16 ft (5 m) (Black) - Ultra-durable System Power Cord - 4.5ft (1.5m), 16-14 AWG (depending on power supply unit) - Manufacturing Service Every STEIGER DYNAMICS system is custom built-to-order from scratch. Depending on your configuration and availability of parts, manufacturing your system will take up to 15 business days after the order was successfully processed. If you are dying to fire up your STEIGER DYNAMICS system as soon as possible, we offer a 5 business day Priority Build Service. Standard Manufacturing Service - Shipped within 10 business days Priority Manufacturing Service - Shipped within 5 business days Warranty & Support All components built into our systems are of highest quality and go through rigorous quality control before they are installed. We are convinced that a no-compromise product like a STEIGER DYNAMICS Home Theater PC deserves only the very best product support. This means: - Every system is complemented with a 2 year limited warranty - We support our products in-house by the very engineers who build them via remote desktop, live chat, email, and phone support - Our US-based support will help you with any trouble even after your warranty period ended; this includes free labor on maintenance and part upgrades 2 Year Part Replacement, 45 Day Free US Shipping, Lifetime Customer Care Total Special Instructions - e.g. drive partitioning, settings, tweaks, special hardware requests, and/or other comments: You have 1000 characters left. Do not use HTML. Please enter your Discount or Gift Certificate Code (if any): Continue Subtotal ~ Ship Date Add to Cart Save Config Print Config Have Questions?Call 1-855-915-9000 Email Us