I have a Logitech K400+ Plus keyboard trackpad combinations WITH USB transmitter included.

Transmitters are stored in the battery tray for each keyboard. AA batteries not included. 

You will need to download the Unifying software and connect the transmitters to the keyboards on first use. 

Make sure you power on the keyboard after installing batteries via the switch on the top of the keyboard. 

No international shipping, continental US only, I prefer not to take returns. Guaranteed to work on arrival.