For some reason, there is not much information about this for ordinary mice and keyboards (non-unifying). I faced. The receiver is not sold separately (Unifying is everywhere), but if it is lost, then we buy the cheapest Logitech wireless mouse (B170, M170) for ~ 500, against this set for 1500, look for the Logitech Connection Utility and rebind them to a new receiver. The keyboard does not have an on/off switch, so the process involves removing and inserting the battery.
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