Background
The Logitech K400 Plus is a compact wireless keyboard with an integrated multi-touch touchpad designed for couch-friendly control of PCs and compatible smart TVs. It connects via a Logitech Unifying USB receiver and offers a reliable 10 m (33 ft) wireless range for living-room navigation. Quiet keys, dedicated media controls, and long battery life make it a popular choice for home entertainment setups. While durable, internal access typically requires removing hidden screws and carefully prying clips, so repairs benefit from patience and proper tools.
Identification
The Logitech Wireless Touch Keyboard K400 Plus can be identified by the model number ("M/N") C-U0008/Y-R0055 (or part numbers, "P/N") 920-007119, 920-007121, 920-007123, 920-007125, 920-007127, 920-007128, 920-007129, 920-007130, 920-007131, 920-007132, 920-007133, 920-007134, 920-007135, 920-007136, 920-007137, 920-007138, 920-007139, 920-007141, 920-007142, 920-007143, 920-007144, 920-007145, 920-007146, 920-007147, 920-007148, 920-007149, 920-007150, 920-007151, 920-007152, 920-007153, 920-007155, 920-007157, 920-007161, 920-007165, 920-007166, 920-007167, 920-007168, 920-007169, 920-007171, 920-007173, 920-007175, 920-007176, 920-008385, 920-008465, 920-009280, 995-000391, 997-000353 depending on region, vendor, and color. The model and part numbers can be found Printed on the underside label near the power switch and battery compartment. The device's serial number is also listed here, labeled "S/N."
Specifications
- Model: K400 Plus (Wireless Touch Keyboard)
- Wireless Technology: 2.4 GHz Logitech Unifying
- Connection Interface: USB-A Unifying receiver (non-Bluetooth)
- Wireless Range: Up to 10 meters (33 feet)
- Touchpad: Integrated multi-touch touchpad with gesture support
- Battery Life: Up to 18 months (usage dependent)
- Power: 2 × AA batteries (replaceable)
- Dimensions: Approx. 354.3 × 139.9 × 23.5 mm (W × H × D)
- Weight: Approx. 390 g (with batteries)
- Compatibility: Windows 7/8/10 or later, Android 5.0+, ChromeOS, select smart TVs
- Software Support: Logitech Options and Logitech Unifying Software
- Media Controls: Dedicated volume and playback hotkeys
Troubleshooting
For dropouts or cursor lag, replace the AA batteries, move the Unifying receiver to a front USB port or extender, and re-pair with Logitech Unifying Software. If keys or the touchpad are unresponsive, clean debris, reduce 2.4 GHz interference, and check internal ribbon connections if disassembling. Update drivers/firmware via Logitech Options or the support site and test on another PC to isolate receiver vs. keyboard faults.
For additional troubleshooting help, visit: For drivers, pairing tools, FAQs, and contact options, visit Logitech Support for K400 Plus.
Additional Information
Warranty Info
1-year limited hardware warranty (duration may vary by region).
