Logitech Unifying receiver - Wikipedia
https://en.wikipedia.org/wiki/Logitech_Unifying_receiver
WEBThe Logitech Unifying Receiver is a small dedicated USB wireless receiver, based on the nRF24L-family of RF devices, that allows up to six compatible Logitech human interface devices (such as mice, trackballs, touchpads, and keyboards; headphones are not compatible) to be linked to the same computer using 2.4 GHz band radio communication ...
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