The bicycle rear light has a 180 degree sight and wide-angle design, which will make you more clearly visible to other road users in dark night or day The bicycle light rechargeable brake detection sensor can prevent splashing water from any angle and can be used in any extreme weather Built-in accelerometer built into the bright bike taillights ensures detection precise braking. With brake sensor, the auto super bright brake light will turn on automatically after braking The LED bike light's built-in 500mAh polymer lithium battery comes with a USB cable, which can be charged from your computer, wall charger, power bank or any other device with a USB port In "Fast Flash and Breath" mode with the smart bike tail light, the LED bike light s Automatically turns on at low light and will turn off under high intensity lights Color: Black Size: 8.2*3.5*4cm Quantity delivered: 2 pieces