1. It uses 655nm far-infrared rays to soothe hair follicles ,stimulate the secretion of proliferation factors in the dermal papilla , and promote hair growth. 2. 12, 000 times/ min high-frequency sound wave vibration Name: Red light guide medicine comb Rated voltage: 3.7V Rated input: 5V1A Rated power: 1V Battery capacity: 260mAh Methods of Use 1. Comb from temple to rear wind pond 2. Comb from forehead Yintang point to rear Fengchi point 3. Draw a "Z" shape, front to back 4. Comb your hair as you please Colour:White Material:PC+ABS Package Contents: 1 x guide comb 1 x Type-C charging cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.