Logitech Unifying Receiver for Connecting Multiple Devices
Looleking USB Receiver for Mouse and Keyboard Compatible with Logitech Unifying M505 M510 M515 MK520 M525 MK550 M560 M570 M600 MK605 T620 MK710 K750 K800 TK820 K830 M905 MX M950 : Amazon.ca:
Logitech USB Unifying Receiver - 2 Pack - Walmart.com
Logitech USB Unifying Receiver 910-005235 - Best Buy
Unifying Receiver for Mouse and Keyboard Compatible for Any Logitech Product That Display The Unifying Logo (Orange Star, Connects up to 6 Devices) : Amazon.in: Computers & Accessories