Features: 100% Brand New Totally amazing party attraction，you will love the way your mouth glows Made of a clear， soft silicone， each flashing mouth piece brilliantly flashes multi-color lights Wear your flashing mouthpiece to any party or picnic and been seen today Simple push-button on/off operation Completely sealed for personal safety Blinks in Alternating Colors Make your smile truly beam Hand-washable Color of Body: Transparent Color of LED Light: Red， Green， Yellow and Blue Number of Light: 4 Measure of Fixing Groove: Approx. 2.5 x 1 x 0.8cm(L x W x H) Measure of Flashing Piece: Approx. 28 x 9.5mm( Dia. x H) Material: Non-toxic Silicone Net Weight: approx. 8g How to Use It: 1. Downward the grooves， put the mouthpiece on your lower teeth 2. Bite the piece， and press the button with your tongue to turn on/off( Shown as the following picture) Package Included: 1 x 4 Colors LED Flashing Light Flash Mouth Guard Piece