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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
Wireless 2.4G Receiver Computer Keyboard and Mouse Transmitter USB 6 Channel Receiver Dongle Mouse Adapter for Logitech - Walmart.com