Description:USB rechargeable bicycle taillight and auto cut off when fully charged.High quality internal lithium battery,only need about 2 hours to be fully charged while be used for about 12 hours.Long Steady Bright----4 HoursSlow Flash----10 Hoursflash in order---12 HoursStrobe Flash----8 Hours4 modes:Long Bright,slow flash,flash in order and strobe.Super waterproof,make you riding freely regardless of rain.High brightness and saving LED.Name: Bicycle Rear LED LightColor: Five colors mixSize: 7.5*3*2cm/2.95*1.18*0.79"Material: PlasticPower Supply: USB ChargeLighting Mode: 4 Modes: Long bright/Slow flashing/flashing in order/StrobeWaterproof: YesLumens: 15 LumensHeadlight:Material: PC lampshade ABS lamp coversSize:.6 * 2.9 * 2.2 cmApplicable vehicle tube diameter: 20-40mmCharging time: 3 hours from USBDischarge time: highlight 3 hours, low light 5 hours, glossy 12 hoursPackage Included:1x Bicycle LightNotes:1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!2. Please allow 0.1-2cm measuring deviation due to manual measurement.