Each night light is thoroughly tested. Long life, can lasts all night or more.(The battery is not included in the package). The mask has a led light strip, uses two AA batteries, connects the buckle, presses the a button that controls 4 modes – off, constant on, slow flicker, fast flicker. 【QUALITY GUARANTEE】- Ensures 100% top quality of our Light up Masks. The bottom also looks cool with just a plain white bandeau top.