10 * LED Sound Aktivierte Rave Halloween Blinkende Gesichtsmasken JOB-LOSE - ZU LÖSCHEN

Put 2 AAA batteries (NOT INCLUDED) into battery pocket, then turn on the switch. While you start speaking, the mask will light up, and if you just want to modify the perceived speed of the led sounds mask, you can rotate the wheel on the side, very easy.

eBay