Mr. Beams MB723 Battery-Powered Motion-Sensing LED Stick-Anywhere Nightlight (White) -Pack of 3

To replace the batteries, would I have to pull the entire unit off of the tape holding it onto the wall? Or, is there a way to replace the batteries without removing the entire base from the wall?

Do these lights have light sensors in addition to motion sensors? Would they turn on during the day when I walk by or they're on only at night? Thx.

If I mounted this inside a window, facing outside, will it detect motion thru the window?

We have two cats. Do you think the cats will trip the sensor?