Features: With a 6ml serum cabins in the middle of the brush, it can help you apply essential-oil evenly and easily while massaging your scalp. Tooth-tip Massage: The massage relaxes the head muscles, andcontinuously removes debris, dirt, and oil from the scalp. All you have to do is move-it to different parts of scalp while the bristles do all the work. It feels like a steady continuous pinching and releasing in a pleasant way. The massage feels especially great around the back of scalp and nape of neck. Waterproof, no problem with rinsing, super waterproof performance, clean, hygienic, unclogged, safe, and comfortable. Red light works right in the dermis to promote enhanced collagen and elastin production. Notice improved skin elasticity and texture with regular red light treatments. Perfect for on-the-go hair care, it's an excellent choice as a thoughtful present for family and friends on birthdays, as souvenirs. Notice: 1. Actual color may be slightly different from the image due to different light effect 2. Please allow 1-3cm deviation due to manual measurement Description: Size: 21x8.5x5.7CM Rated voltage: 3.7V Rated power: 5W Battery capacity: 1400mAh Charging interface: Type-C Package: Electronic Red Light Hair Massager and USB charging cable and storage bag and manual and color box