Dual-Fuel Power with three AAA Alkaline cells (included) or the rechargeable BD 1500 Li-ion battery and charger (purchased separately) for maximum flexibility 350 Lumen max output 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 % of power remaining Digital lock mode feature safeguards against accidental use when stored in a pack or pocket Black Diamond Cosmo 350 Headlamp