Logitech M570 Wireless Trackball Mouse – Ergonomic Design with Sculpted Right-Hand Shape Compatible with Apple Mac and Microsoft Windows Computers USB Unifying Receiver Dark Gray 910-001799 | Fast Server Corp. www.srvfast.com
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 Unifying Receiver for Connecting Multiple Devices
Amazon.com: Logitech USB Unifying Receiver - 2 Pack : Electronics
Wireless Dongle Receiver Unifying USB Adapter for logitech Mouse Keyboard Connect 6 Device for MX M905 M510 Keyboard K400|Wireless Adapter| - AliExpress
New Logitech Unifying USB Receiver for Mouse and Keyboard, (993-000596) – nayejaisa.com
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 Unifying Receiver for Connecting Multiple Devices