Black Diamond Astro 300 LED Headlamp - The simple yet versatile one lens and one switch headlamp for the user that doesn't need any bells or whistles and just wants a simple light. This user has the need to run the lamp on alkaline batteries if caught away from a power source for a long camping trip. 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