Securitylng 600 Lumens Waterproof 3 Mode XM-L T6 LED Sport Light Headlamp with Charger Super Bright Bike Headlamp - Maximum brightness comes to 600 lumens. Can throw a beam over 500 feet into the darkness. 3 Modes Available - Intelligent circuit control, single button on the back of the lamp cycles through multiple settings (full beam - low beam - strobe mode) Waterproof Design - Waterproof and weather resistant. Support normal use in torrential rain. Perfect item for outdoor sports, such as camping, traveling, hiking, cycling, searching. Wide Working Voltage - Internal wiring applies the high efficient booster circuit, working voltage is wide and can utilize the batteries in the largest extent. Power Source: Powered by 2 x 3.7V 18650 Rechargeable Batteries (Not Included). Battery overcharge protection, low battery warning.