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
Amazon.com: Logitech M705 Wireless Mouse - Marathon Ergonomic Sculpted Right-Hand with USB Unifying Receiver for PC Computers, Laptops, Mac, Chromebook, Includes Life-Extended Cleaning Kit - Silver : Electronics
Logitech M705 Wireless Mouse With Unifying usb Receiver - FREE SHIPPING 71030562332 | eBay
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Logitech's USB Unifying Receiver: one dongle to serve multiple input peripherals | Engadget