Features: This LED Comb combine with red light and blue light and Virbration mode. 2 in 1, more powerful and more useful than any other cheap comb. With factory red and blue technology, high quality of the comb. 21 Number of diodes, good for point treatment and full scalp coverage. This targeted light treatment delivers nourishing red/ blue light energy directly to your hair follicles to reverse the thinning process and regrow your hair. Delivers therapeutic light energy to stimulate hair follicles, reverse thinning, restore your hairs natural growth cycle and promote hair growth 10-15 Minutes treatment time, 3 days a week Apart from hair parting teeth, easy to wash and clean Cordless & lightweight, plug and chargeable battery included. Name: 2-in-1 electric fluid guide comb Output wavelength: 650nm visible red light Number of lamp beads: 12 Battery capacity: 1000mAH Input voltage: 5V Charging mode: USB Packing list: Hair growth comb, replacement massage head, storage base, charging cable, instruction manual