blue LED light whitening item rapidly remove surface stains and penetrate deep to remove embedded stains 1, blue LED light whitening item rapidly remove surface stains and penetrate deep to remove embedded stains2, Designed for home use 3, Easy to operate 4, Power supply: 3V DC/2 x CR2025 Parts: 5, light transmitter: One-piece 6, CR2025 lithium battery: Two-pieces