... whitening gel,Rapidly remove surface stains. 1,teeth whitening light adopt light treatment technology, combined whitening gel,Rapidly remove surface stains.2 ... and penetrate deep to remove embedded stains 3, Designed for home use 4, Easy to operate 5, Power supply: 3V DC ... /2 x CR2025 Parts: 6, light transmitter: One-piece 7, CR2025 lithium battery: Two-pieces