The HP Pavilion Wired Keyboard and Mouse 400 (part 4CE97AA) is a matching full-size keyboard and optical mouse set for home and office desktop or laptop users who want a slim, tidy plug-and-play setup without batteries or pairing. Both devices connect with their own USB-A cable, so they work as soon as they are plugged into any free USB port, with no software required. The keyboard is a full-size, straight-layout design with a numeric keypad and Windows keys, finished in black, and measures 410.1 x 114.2 x 22.3 mm; the wired mouse measures 119.4 x 64.9 x 32 mm. HP lists support for Windows 7, 8 and 10, and the set needs only standard USB HID drivers. The box contains the keyboard, the mouse and a warranty card. It suits front desks, classrooms and home offices where a reliable, cable-connected set is preferred over wireless.