Runs on 4 AAA Batteries.
0 inches (W) x 9. (not included) Specs Color: black/silver Materials: plastic Product dimensions: 2 H x 9.0 inches (H) x 6.5 L x 2 W Built-in rays of cool infrared light lasers & vibration technology Infrared LED light Cordless Lightweight Portable This comb stimulates hair follicle growth at the root with penetrating therapeutic light to increase blood flow to the scalp.