Features:USB rechargeable bicycle taillight and auto cut off when fully charged. internal lithium battery,only need about 2 hours to be fullyCharged while be used for about 12 hours.Long Steady Bright- - 2 HoursSlow Flash- - 10 HoursSuper Flash- - 6 HoursStrobe Flash- - 8 Hours4 modes: Long Bright, slow flash, explosion flash and strobe.Super waterproof, make you riding freely regardless of rain.High brightness and energy saving LED.Front Light (USB Rechargeable):Material: PCandABSSize: Approx.65mmx29mmx23mmLight Source: XPE 3W LEDLight Color: BlackOutput (Maximum): 300lmLighting Distance: 30-50meters at night3 Working Modes: High-Medium-StrobePower Source: 800mAh Li-Poly BatteryCharging Time: Approx.3hoursRunning Time:High: 3 HoursMedium: 5 HoursFlashing: 12 HoursFit Handlebar: 20-40mmRear Light (USB Rechargeable):Size: Approx.7.532cmBulb Type: LEDsBrightness: 15 lumensColor: RedLED Light: White, RedPackage Weight: Approx.50gMounting Placement: Bicycle Seat PostSuitable Tube Diameter: Approx.12-32mmPackage Included:1Front Light or 1Front Light and 1Rear Light Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.