Black Diamond Astro 300 Headlamp Graphite One Size. This user has the need to run the lamp on alkaline batteries if caught away from a power source for a long camping trip. Specifications for Black Diamond Astro 300 Headlamp: Manufacturer: Black Diamond Light Output: 300 lumens Battery Type: AAA Bulb Type: LED Weight: 42 g Condition: New Battery Quantity: 3 Features of Black Diamond Astro 300 Headlamp Dual-Fuel: Power with three AAA Alkaline cells (included) or the rechargeable BD 1500 Li-ion battery and charger (purchased separately) for maximum flexibility Settings include full strength dimming and strobe Brightness Memory allows you to turn the headlamp on and off at last used brightness level without reverting to max brightness IPX4 Stormproof: withstands rain and sleet from any angle Digital lock mode feature safeguards against accidental use when stored in a pack or pocket Package Contents: Black Diamond Astro 300 Headlamp Black Diamond BD6206740004ALL1: Astro 300 Headlamp Graphite One Size