The Black Diamond Cosmo 350 Headlamp packs 350 lumens of brightness into a compact, ergonomic, and waterproof build. Dual-fuel capability gives you the choice of using the rechargeable BD 1500 Li-ion battery (sold separately) or the included AAA batteries. It features red night vision with dimming and strobe modes and a digital lockout for secure storage. A multifaceted lens improves battery life and light efficiency, making the Cosmo 350 a solid companion for any tactical situation.