Black Diamond Cosmo 3 AAA 350 Lumens Headlamp Octane. This user has the need to run the lamp on alkaline batteries if caught away from a power source for a long backpacking trip. Specifications for Black Diamond Cosmo 350 Headlamp: Manufacturer: Black Diamond Light Output: 350 lumens Battery Type: AAA Bulb Type: LED Battery Quantity: 3 Features of Black Diamond Cosmo 350 Headlamp Max Distance: (High) 64 m (Medium) 45 m (Low) 10 m Dual-Fuel: Power with three AAA Alkaline cells (included) or the rechargeable BD 1500 Li-ion battery and charger (purchased separately) for maximum flexibility Red LED night vision has dimming and strobe modes and is quickly activated with dual-button interface Settings include dimming strobe red night-vision and lock mode Multifaceted optical lens design IPX8: Waterproof-Tested to operate at least 1.1 meters underwater for 30 minutes. If submerged water may enter the battery compartment and it will still operate; it should be completely dried out after use in wet conditions Integrated battery meter display shows percent of power remaining Digital lock mode feature safeguards against accidental use when stored in a pack or pocket Package Contents: Black Diamond Cosmo 350 Headlamp Black Diamond BD6207518001ALL1: Cosmo 3 AAA 350 Lumens Headlamp Octane