Logitech Black K400r Wireless Slim Keyboard Touchpad with USB Unifying Receiver

Logitech K400R Black Wireless USB Built-in Touchpad QWERTY Standard Keyboard

Logitech K400R Wireless Touch Keyboard with Touchpad Black - No Receiver/Adapter

Logitech K400r Wireless Keyboard Built-In Multi-Touch Touchpad w/ Dongle

Logitech K400r Wireless Slim Keyboard Built-In Touchpad White QWERTY

Logitech K400r Wireless Touch Keyboard Model : Y-R0019 ( No USB Receiver )

Logitech K400 Wireless Keyboard Built-In Touchpad Black QWERTY Layout B111

Logitech K400 Plus Wireless Keyboard Built-In Touchpad Black (missing receiver)