Front and rear set provides better visibility and safer riding at night. easy to use, hold the power button for 1.5 seconds to turn on or off. 5 modes switchable: constant, slow flash, fast flash, super fast flash, breathing flash. the rear turns off automatically in stationary state for 40 seconds, and turns on when any vibration is sensed. built-in 400mah battery is rechargeable from any device with 5v usb output, such as computer, laptop, or power bank.
