Putting a mini glowstick in your mouth is so 1990s... enter the high tech age with the battery-operated Multi-Glow Flashing Mouth. 4 awesome red, green, blue, and yellow LEDs will make your smile truly beam! The rubber Multi-Glow Flashing Mouth sits comfortably in your mouth over your teeth and fits most teens and adults. For your safety, batteries are not replaceable. Just push on and off; hand-washable and reusable.