BD Black Diamond Astro 300, small enough to bring just in case, but bright enough to light the way down unexpected rappels and dark trails, features a compact body that is ergonomic with a low profile for better balance. In addition, the updated optical efficiency provides brighter light at 300 lumens. New for the Astro is its Dual-Fuel compatibility, allowing you to power the light with either the rechargeable BD 1500 Li-ion battery (not included) or three standard AAA batteries (included). The Astro's dimming and strobe modes let you customize the lighting to your needs, and the highly weather resistant housing withstands rain and sleet from any angle.   Product Features: Dual-Fuel: Maximum flexibility to utilize either Alkaline cells or a rechargeable Lithium Ion BD 1500 battery (sold separately). Emits up to 300 lumens on max setting. Settings include full strength, dimming and strobe. Brightness Memory allows you to turn the light on and off at a chosen brightness without reverting back to full power. IPX 4 Stormproof: withstands rain and sleet from any angle. BD Black Diamond Astro 300 headlamp