Re-Program your keyboard & mouse receiver with Logitech Connection Utility - YouTube
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Logitech MK270 Reliable Wireless Keyboard and Mouse Combo
Pairing A Logitech MK270 Keyboard And Mouse To A Non Unifying Receiver. – wherethingsareborn
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Logitech MK270 Reliable Wireless Keyboard and Mouse Combo
Logitech K270 Wireless Keyboard with Unifying Receiver