Logitech K350 2.4GHZ Wireless Keyboard / Unifying Receiver & Original Box | eBay
NewLogitech Unifying USB Receiver for M905 M600 M525 Mouse K350 K750 Keyboard. – ASA College: Florida
Amazon.com: Logitech Unifying Receiver, 2.4 GHz Wireless Technology, USB Plug Compatible with all Logitech Unifying Devices like Wireless Mouse and Keyboard, PC / Mac / Laptop - Black : Electronics