"low in power" should be "low on power"?
I'm not an English native speaker but the wording of the notifications "Wireless mouse/keyboard is low in power" etc. strikes me as at least a little odd. My gut feeling (which has been corroborated my quick online research) is that it should be "is low on power" or even "is running low on power". "low in power" would indicate that it doesn't consume a lot of power.