I own a Dell KM113 wireless keyboard and mouse combo. Surprisingly enough, the mouse has a power off button while the keyboard does not. I power off the mouse whenever I power off the PC. But, I cannot turn off my keyboard.
They keyboard wakes up my PC if it's asleep. The keyboard also automatically "connects" to my PC every time I turn the latter back on. It makes me suspect that the keyboard batteries are being used up – even when the PC is off – in searching any probable connection.
So, my question: Does my wireless keyboard use up battery even when the PC's off?
Note: The other question is about a working receiver, mine is about a receiver that's off.
Best Answer
In practice, it probably goes into some kind of low power mod, or turns completely off until you press a key
Leaving it on all the time, and checking if there's a signal is pretty dumb. Its detecting the dongle (already paired to the keyboard/mouse), and presumably pairs fast enough not to be noticed.
Its pretty hard to check that without sniffing at local wireless traffic, but its a common, well documented trick to ensure longer lives for batteries in such devices.