This lightweight and compact headlamp has a revolutionary Micro-USB rechargable option. Made from a durable aluminum alloy, it also offers easy, on-handed operation by simply sliding a small switch. The various functions include red, green, and blue modes, infinitely variable mode (between 0.2 and 530 luments, and turbo mode. On turbo mode, it puts out 900 lumens and still offers excellent runtimes. It operates on one 18650 lithium-ion battery and is built to withstand all but the harshest conditions . Great for camping, climbing, caving, or any of your favorite outdoor activities.