Specifications:Photoelectric parameters: white light is bright, white light is low, red light is always bright, red light strobeBrightness: 170 lumens, 20 lumens, 5 lumensLife time: 2 hours, 11 hours, 18 hoursIrradiation distance: 19 meters, 7 metersAnti-fall height: 1 meterWaterproof level: IPX4Light source: COBSpecifications: 61 mm (length) X 46 mm (width) 19 mm (height)Weight: 37.8 grams (lamp body)Material: headlight: ABS plastic; headlight belt: polyesterCharging: charge and discharge function; Type-C direct charge, full charge time is about 2.5 soil 0.5 hours battery: built-in 640mAh lithium battery