This app works about as well as wet toilet paper. It shows my watch as -1% when it's almost fully charged and won't even recognize anything else as existing. I really want the last 40 minutes of my life back, but I guess a one star will have to suffice. But hey if you have too much memory on your phone and you want a useless app, download this one, it won't disappoint. If you want to know how the battery in your speaker is doing, look elsewhere all this one does is interrupt your music with ads.