Amazon.com: Logitech USB 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
Logitech C-UAY59 USB Receiver for V220 Wireless Travel Mouse w/Cradle 810-000272 | eBay
Zone Wireless Plus Unifying + Audio Receiver
Logitech Mini Receiver C-UAK42 Wireless Keyboard/Mouse USB Receiver Dongle - Ryan & Troy Tech Solutions
Logitech M185 Wireless Mouse, 2.4GHz with USB Mini Receiver, BLUE | Oriental Trading
C UAK42 USB Mini Receiver for Logitech MX3000 MX3200 LX710 WAVE S510 LX300 EX100 V22 mouse and keyboard free shipping| | - AliExpress