The Black Diamond Astro 300 Headlamp may be small, but it packs brilliant brightness. It cuts through the darkness with 300 lumens at its maximum setting, and improved optical efficiency provides brighter light at 300 lumens. A compact design creates a lower profile for better balance. Full strength, dimming, and strobe modes allow you to customize the lighting to your needs. Brightness Memory lets you turn the light on and off at a chosen brightness without needing to cycle through the settings again. Weather-resistant housing stands up to the elements for confident use in the field. Powered by 3 AAA batteries (included) or the rechargeable BD 1,500mAh lithium-ion battery (not included).Manufacturer model #: BD620674. 300 lumens at maximum setting Improved optical efficiency for greater brightness Compact, low-profile design Full strength, dimming, and strobe modes Brightness Memory lets you turn the light on and off at a chosen brightness Weather-resistant housing Powered by 3 AAA batteries (included) or BD 1,500mAh lithium-ion battery (not included)