Multifunctional: With max 2,500-lumen output, the Perun 2 can be used as both a right-angle headlamp and as a powerful EDC. Proximity Sensor: Reduce the brightness and power off within 1 minute to prevent overheating when detecting an obstruction nearby. Hands-free Experience: Magnetic base for attaching onto the iron surface, stainless steel pocket clip, and adjustable headband with silicon switch for leaving you both hands to work. Output: 2500 lumensRuntime: 12.5 days Beam Distance: 166 meters Battery 3.6V 4000mAh 21700 (Included) Size 120.7*28.6*27mm