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
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Amazon.com: Logitech New Unifying USB Receiver for Mouse Keyboard M515 M570 M600 N305 MK330 MK520 MK710 MK605 : Electronics
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) : Electronics
Logitech K520 wireless keyboard (no USB receiver Or Mouse) | eBay
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Logitech Unifying Receiver for Connecting Multiple Devices
Logitech Unifying Receiver for Connecting Multiple Devices
Logitech Unifying Receiver for Connecting Multiple Devices
Logitech MK520 Complete Wireless Combo K520 Keyboard and M510 Mouse USB Unifying (920-008972) (Renewed) (920-008972-cr) - Newegg.com