Features: 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----2 Hours Slow Flash----10 Hours Super Flash----6 Hours Strobe Flash----8 Hours 4 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: PC+ABS Size: Approx.65mmx29mmx23mm Light Source: XPE 3W LED Light Color: Black Output (Maximum): 300lm Lighting Distance: 30-50meters at night 3 Working Modes: High-Medium-Strobe Power Source: 800mAh Li-Poly Battery Charging Time: Approx.3hours Running Time: High: 3 Hours Medium: 5 Hours Flashing: 12 Hours Fit Handlebar: 20-40mm Rear Light (USB Rechargeable): Size: Approx.7.5×3×2cm Bulb Type: LEDs Brightness: 15 lumens Color: Red LED Light: White, Red Package Weight: Approx.50g Mounting Placement: Bicycle Seat Post Suitable Tube Diameter: Approx.12-32mm Package Included: 1×Front Light/1×Front Light + 1×Rear Light If you don’t know how to use the product or there is any problem with the product, please contact me to solve the problem first, I will reply as soon as possible, thank you！ The merchant warrants that their products comply with all applicable laws, and are offered only if they comply with Joom's policies and EU Product Safety and Compliance laws.