Bicycle Rear Red Light back light Waterproof USB Rechargeable LED Bike light
Fully charging for about 2-3 hours. 4 LIGHT MODES - Easy to install, no need tools, press the switch to turn it on. With 4 light modes: Steady(4 hours), Slow flashing(10 hours), Super flashing(12 hours), and Cycle flashing(8 hours).