This stimulating silicone brush and massager is waterproof and requires no battery use. It is beyond perfect for various hairstyles from thick through thin, and no matter wet or dry. It easily lifts dandruff scales and removes dead skin cells on the scalp leaving it healthy and fresh, without causing tangles. It’s ergonomic design perfectly fits in the palm of your hand, so it is easy to hold. It is only 1.8 Oz, lightweight and stores easily.