Rechargeable: Powered with integrated 1500 mAh Li-ion battery with micro-USB charge port. 300 Lumen max output. Recycled elastic headband featuring comfortable next to skin Repreve fiber construction. 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. IPX 4 Stormproof: withstands rain and sleet from any angle. Digital lock mode feature safeguards against accidental use when stored in a pack or pocket.