USB Rechargeable: Fast and convenient micro-USB charging. Ultra Mini: As slim as your pinky finger, weighing only 0.46 ounces. Dual Output: Delivers two output modes from 150 lumens on high to 5 lumens on low with a quick twist. Twist to Operate: A quick twist enables you to cycle through both output modes and turns the light ON/OFF. Output: 180 lumensRun time: 12 hoursBeam Distance: 48 meters Battery 70mAh 3.7V Li-ion Battery (Built-in) Size 44*14.8mm