The Einstein™ 1500 FLEX Headlamp by NEBO is a low-profile, compact 1500 lumen headlamp with 5 light modes featuring flex power. Use the included rechargeable battery or 2 x CR123A batteries. 5 LIGHT MODES• Turbo (1500 lumens): 30 seconds / 64 meters• High (750 lumens): 2 hours / 35 meters• Medium (250 lumens): 6 hours / 25 meters• Low (10 lumens): 18 hours / 8 meters• Red COB (5 lumens): 12 hours / 1 meters *Runtime is reduced by about 20% when using 2 x CR123A batteries DESIGN• Compact and lightweight• Durable ABS plastic• Smart Power Control (SPC)• Water resistant (IPX4)• Flex Power• Direct-to-Red OPERATION• Top-positioned buttons for power and mode selection ACCESSORIES• Li-ion 18650 rechargeable battery• One size fits all head strap• USB charging cable BATTERIES• Powered by 1x Li-ion 18650 2200mAh 3.7v or 2xCR123A batteries SPECS• Weight: 450 grams• (L) 12.7㎝ X (W) 5.08㎝ X (H) 7.62㎝