I have one of those too for my son’s crib, two AA batteries will last you about a month or two (we use it each night.) Highly recommended!
Funny thing is he’s 8 months old now and I’m not sure he actually likes having it play the music any more? He’s learned to turn it off by pressing his face against the stomach… not every time though. But when he doesn’t want it on, he very deliberately crawls over to it, presses his nose to it, and it turns it off. At least he can decide when he doesn’t want it on!
Funny thing is he’s 8 months old now and I’m not sure he actually likes having it play the music any more? He’s learned to turn it off by pressing his face against the stomach… not every time though. But when he doesn’t want it on, he very deliberately crawls over to it, presses his nose to it, and it turns it off. At least he can decide when he doesn’t want it on!