This is the Plex PX-W3U4 USB TV tuner. This model allows you to watch and record 2 terrestrial digital channels + 2 BS/CS channels, for a total of 4 channels. [Specifications] ・USB 2.0 connection / with AC adapter ・Supported OS: Windows 10/11 (including 64-bit) ・B-CAS card compatible (included) / Drivers must be downloaded from the manufacturer's official website [Condition] ・Scratches and signs of use on the exterior ・Included items: Main unit, AC adapter, USB cable, built-in B-CAS card reader ※Setting up may be difficult for PC beginners (driver and viewing software setup required). ※Please refrain from purchasing if you are sensitive to used items.