Cozy Smile 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. Cozy is fully waterproof which means you can use it in the shower or in the pool etc. has an internal timer that shuts off the device after 15 minute session and is totally rechargeable. COME GET COZY!                                       •On average, each 15 minute session whitens your teeth 2-3 shades lighter.                                                                             •Includes: 1 teeth whitening light, 1 charger, 1 shade guide 1 instruction guide and 3 whitening gel pens (24 month shelf life for gel)