The Inventiv sound recording module is built into a premium quality heart shaped casing. This is our new version with upgraded sound quality for louder and more clear playback; it can easily be heard through fabric/material. If the battery ever dies, you can easily change it out. The battery size is an LR44 and can easily be purchased locally or online. This is a unique feature that you won’t typically find in other similar recording modules. It is super easy to operate; we include an instruction manual and how to video. Just turn the switch to record mode; squeeze and hold while recording your message. Turn the switch to playback mode; squeeze once to play back your message. Install in a plush toy for a unique one of a kind gift!