The most advanced technology on the market: the Cozy Kit is waterproof and wireless. Cozy features blue light therapy and dual light therapy.You can receive a whitening session and oral care treatment all in one with our dual light therapy setting. The Cozy Kit is very special to us. Wanna know why? WATERPROOF! The Cozy Kit is fully waterproof which means you can use it in the shower, pool, etc. The Cozy Kit has an internal timer that shuts off the device after a 15 minute session and is totally rechargeable. Come get Cozy with our bestie, Cozy.