Function: light sense to trigger button and play music. 3 AAA battery power supply 8 0.25W environmental speaker the sound is large enough. Manufacturered by Diyeeni. This module has been welded with microphone key speaker and battery etc. and can be used after receiving the product which is very convenient. Great for Christmas cards gift boxes jewelry boxes crafts children's toys etc. Customizable to record music or whatever you want to say for up to 4 minutes.