Teeth Flashing LED Light, Cosplay Halloween Party Glow LED Prop, Mouth Teeth Guard Piece Gadget Party Glow SuppliesHow to Use? 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).Specifications Material: silicone. Size: shown as picture. Flashing Color: red, blue, green, yellow (blinks in alternating colors).Notes 1.Please understand there may be mild deviation exist. 2.Due to the lighting and monitors, there are slight difference between the picture and the realitem.Package Content 1 * LED Flashing Light Flash Mouth Guard Piece(Built-in AG13 button battery (not included)).Promise If the product has any quality problems, please feel free to contact us, we will help you solve the problem as quickly as possible.