The manual mode and automatic mode can be switched. Press the on/off button for a long time, and press the button for a short time to switch the lighting mode The normally on gear is in manual mode and is not controlled by the light-sensing riding state The other five gears are in automatic mode: breath flash - slow flash - fast flash - rhythm flash - energy-saving flash Under automatic mode, there is mutual control of light sense and vibration sense In any mode, there is a brake warning function. When the brake is detected, the tail lamp enters the constant light mode with high brightness for 3 seconds When the ambient light is dim, the taillight will turn on immediately if you move the bike slightly. If you do not move the bike within 30 seconds, the taillight will turn off automatically Power reminder function: short press the switch in the shutdown state, the power is more than 80%, and the green light is always on for 2 seconds; When the power is less than 20%, the green light flashes for 2 seconds; The power is 20% - 80%, and the green light flashes slowly for 2 seconds. When the tail light is on, the green light flashes quickly for 1 minute, which means the power is less than 20% Specifications: Material: ABS+PC Waterproof grade: IPX5 Lamp beads: 24 high-brightness LEDs Product size: 50*34mm Battery: 400mAh lithium battery Charging current: 280MA Charging time: 2 hours and 20 minutes, standby time up to 1 year Endurance time: normally on for 15h - breathing flash for 18h - slow flash for 25h - fast flash for 27h - rhythm flash for 27h - energy saving flash for 48h Charging indicator: charging: flashing, fully charged: always on Package included: 1 x Tail Light 1 x Charging Cable Other items not included