They're back! These cuties use low-intensity vibration for calming, organizing and to provide oral input/stimulation. This is the only continuous "on" chewable and durable oral facial massager. Install one "AA" battery (not included) and give the head a twist to start the action. The elephant's ears can also be used as a spoon for orally defensive children. Use of this product requires adult supervision at all times. Please inspect regularly and discard at a any sign of wear.