Nitecore HC90 Rechargeable Headlamp, Black USB rechargeable / powered by 1 x 18650 lithium-ion battery (not included) Utilizes a premium CREE XM-L2(T6) LED Max 900 lumens of output High-efficiency circuit provides up to 200 hours of runtime on low Waterproof in accordance with IPX-8 (two meters submersible)