Features:Great for sports (night running, walking, hiking, biking, mountain biking), walking (better dog sighting) and kids on the ways to schoolWaterproof and Comfortable: The headlight has a compact design and is easy to carry. The lights are waterproof and can also be used in harsh weather conditionsUSB Rechargeable: This headlight comes with a built-in battery that can be charged via the USB port4 Lighting Modes: Just press the power button to cycle through each light mode. Three different intensities can be set. The red LED is used as a flash.Versatile, with the practical clip clip, it can be clipped to hats, shirts, jackets, satchels, strollers or dog harnesses.Notice:1.Actual color may be slightly different from the image due to different light effect2.Please allow 1-3cm deviation due to manual measurementDescription:Lamp: 6.542.5cmBattery: Lithiums polymer battery (3.7V/300MAH)Lamp material: ABS plastic (28.5g)Function:1. Press to turn on and switch between 3 light intensity levels + SOS function2. 120 lumen3. Level 1: 2 hours, Level 2: 3.5 hours, Level 3: 5 hours, SOS function: red light flashes for 10 hoursCharging voltage: 5VBattery capacity: 300MAHSRated power: 1WCharging time: about 2 hours