Watch video: https://youtu.be/d5061Cxykq8

Bike Bicycle Light USB LED Rechargeable Set Mountain 
Cycle Front Back Headlight Lamp Flashlight
Note:1. The taillights can be charged with USB
2.The taillight is fully charged in 2h, and the taillight is always on for 3h
3.The taillights need to long press the button to work!!!
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