ROCKBROS 10000mAh MTB Mountain Bike Front Light Smart Headlight Waterproof USB
Battery: about 2x18650 lithium batteries (2400mAh), about2x21700 lithium battery (10000mAh). Waterproof: IPX6. Lamp Beads: 2X5050 High Power LED,2X5050 High Power LED. Low light > OFF in sequence.