Nightstick USB-4708B: With a waterproof aircraft-grade 6061-T6 aluminum housing, this sleek headlamp is as durable as it is convenient. Use the low-profile ratchet tilt head to place light where needed while adjusting between 4 lighting modes (High/Med/Low/Strobe). Charging takes place inside of the light, so the built-in waterproof micro-USB port has a small battery voltage monitor with a RED/GREEN LED charging indicator for easy reference. Also included is a 2 foot USB to micro-USB cord along with lithium-ion rechargeable battery.