UPGRADED ARROW BIKE TURN SIGNAL: Bike tail light with new arrow tail light design, cool and stylish, 5 modes with USB charging, brake red light to keep you safe in the shade or at night. (Note: This taillight is not recommended for daytime use) Remote control bicycle tail light: The bicycle tail light is remote controlled, and the remote control is fixed on the handlebar, which can control the bicycle tail light at any time. (Note: The maximum control distance of the remote control (barrier-free): 3-4 meters, if there is any problem with the remote control, please feel free to contact us for replacement) IPX5 Waterproof Rear Bicycle Light: The bicycle turn signal is IPX5 waterproof, and it is free to ride in rainy days. (Note: Please do not use this bicycle tail light in heavy rain) Wide Application of Bicycle Tail Lights: Bicycle brake lights with high quality rubber bands are suitable for most styles of bicycles. (Note: Not compatible with bicycle seat tubes with a diameter of more than 4.5cm) Large capacity battery: The battery of the bicycle tail light is 800mah, USB direct charge, 2 hours full charge, can reach 5.5-12 hours long battery life.