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
Nano Receiver for Logitech Mouse M235/M310/M310T/M320/M325/M330/M345/T400/ M505 | eBay
Logitech M505 Wireless Mouse For Notebooks - Silver at TigerDirect.com
Wireless Dongle Receiver Usb Adapter For Logitech Unifying Mouse Connect Mx M905 M950 M505 M510 M525 Etcm235, M280, M310, M310t - Pc Hardware Cables & Adapters - AliExpress
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