The Black Diamond Cosmo 350 is a compact, lightweight headlamp built for camping, trekking, backpacking, travel, and everyday outdoor use. Producing 350 lumens of bright, reliable light, it features a simple dual-button interface, red night vision, and Dual-Fuel compatibility, allowing it to run on either the included AAA batteries or the optional Black Diamond BD 1500 rechargeable Li-ion battery. Its rugged IPX8 waterproof construction ensures dependable performance in rain and harsh mountain conditions