The Keyboard battery cover for Logitech K400R K400PLUS
Logitech K400 Plus Keyboard 2.4G Wireless Keyboard Gaming Laptop PC Gamer Ergonomics Touchpad Mini Unifying Receiver
Logitech K400 Professional Wireless Touch Keyboard Wireless Connectivity RF 33 ft USB InterfaceTouchPad PC Windows iOS Android Linux AA Battery Size Supported Black - Office Depot