[crobertsbmw]

It uses a small CR2320 battery. To access the battery you'll need to remove a sticker on the back cover, and then the battery is glued in with hot glue, so you'll need some pliers to remove the glue, and then you'll need a small tool to push the battery out of the circuit board. Rest assured, it's not going to be an easy battery to remove.

[1024core]

With children, that's a risky belief.

[crobertsbmw]

Yeah, this hadn’t really occurred to me when I initially designed it. But it’s now my largest concern as well.

[harperlee]

Most baby books with sound use a plastic case with a screw for button battery safety.