Amazon.com: Logitech USB Unifying Receiver - 2 Pack For Personal Computer : Electronics
How to Pair Logitech Mouse or Keyboard to USB Receiver - YouTube
Amazon.com: Logitech C-U0007 Unifying Receiver for Mouse and Keyboard Works with Any Logitech Product That Display The Unifying Logo (Orange Star, Connects up to 6 Devices) (C-U0007) : Electronics