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
Logitech MK550 Wireless Wave Combo 920-002555 B&H Photo Video
USB Mini Receiver for Logitech C-UAK42 MX3000 MX3200 LX710 WAVE S510 LX300 EX100 V22 mouse and keyboard - AliExpress
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
Original Logitech USB Receiver for Logitech Cordless Desktop Wave Pro M/n. Y-rbn90 (Keyboard), M-rcr... (CUBE35) for sale online | eBay