Portable Intelligent Sensing Brake Light Safety Warning Light USB Charging Waterproof Lamp With Electricity Display Taillight 1. Material: plastic 2. Weight: about 50 grams 3. Size: about 4.5x3.4 cm 4. Battery capacity: 350mAh 5. Charging port: USB 6. Lamp beads: 24 LED lamp beads Features: 1. Lens lampshade, with 24 high-brightness LED lamp beads, the light is soft and not dazzling 2. The installation angle is automatically calibrated, the slope is adaptive, and the braking accuracy is always maintained 3. One-key switch between manualsmart mode, long press to switch the light, short press to switch the flashing mode (the constant light mode is manual mode: not controlled by light sensor and riding status, the other 5 flashing positions are smart mode: light dark + riding tail light bright bright light + riding tail light off dark light + riding delay 45 seconds tail light off long press to switch the light) 4. It can filter small rolling motions and small bumps, but too large pits and damping belts will still activate the brake warning lights 5. Life waterproof design, can be used in rainy days 6. Power display function, short press the switch when shutting down, the green indicator light indicates the remaining power (the power is above 80%, the green light is always on for 2 seconds the power is 20-80%, the green light flashes slowly for 2 seconds the power is less than 20%, the green light flashes quickly 2 seconds) 7. Contains 350mAh battery, USB charging, easy to use