Product Name: smart bicycle tail lamp Model: super I Battery voltage: 3.7V Battery capacity; 420mah Material: aluminum alloy, plastic Charging time: 1 hour 40 minutes Specifications: 1. Brake sensing, sensitive braking, near zero misjudgment, tail light highlights for 3 seconds when brake is detected 2. Slope adaptation When going downhill, the chip automatically corrects the angle according to the algorithm to ensure the accuracy of braking induction 3. Mobile start and stop When the light is dark, move the bicycle and the tail light will be on automatically; If the bicycle is not moved within 30 seconds, the tail light will go out automatically 4.26.5 hours long battery life, micro USB charging, charging time about 1 hour 40 minutes 5. Power reminder function, the power indicator and auto indicator are the same indicator Package Included: tail lamp * 1 strap x2, instruction x1 data line * 1 base support x 1 antiskid rubber pad (x2)