Dual-Fuel Power with three AAA Alkaline cells (included) or the rechargeable BD 1500 Li-ion battery and charger (purchased separately) for maximum flexibility 300 Lumen max output 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 Black Diamond Astro 300 Headlamp