This intelligent brake tail lamp, with six lighting modes, can use USB chargings, long-term endurance, double bracket installation, waterproof and compact, can add more securitys for your outdoor riding. Features: Intelligent brake sensing: built in high-density speed sensor. When sensing the deceleration of the bike, the tail lamp can also quickly detect it. The lamp will continue to highlight for 3 seconds to warn the rear. Intelligent motion sensing: when the surrounding light is dark, move the bicycle slightly, and the tail light will be on immediately. If you don't move the car within 45 seconds, the tail lights will go out automatically. Horizontal angle adaptation: the tail lamp can be adjusted horizontally according to different angles of the stick, so as to maintain the accuracy of braking. Bright LED lamp beads: 16 LED lamp beads with perspective lampshade, high brightness, soft light, not dazzling. Manual / automatic, dual mode: when the tail light is working, double-click the switch, and the green light of the button flashes to the automatic mode. Press the switch for a long time, the green light goes out, the manual mode is switched, the light is on for a long time, and the intelligent brake is applied. USB chargings, long lifes: built in battery, long lifes. Six modes, switch at will: power on mode, manual mode, click the button to switch the mode in turn, including: keep on mode, breath flash mode, slow flash mode, quick flash mode, rhythm flash mode, ECO flash mode. Intelligent display of different power levels: manual mode, power off state, after startup, can display power, power indicator light on for 2 seconds. Green light for more than 80% power, blue light for 30% ~ 80% power, red light for less than 30%. Compact and portable: mini and compact, easy to put into pocket or backpack, easy to carry. Double bracket installation: seats tube or cushion installation, tool free installation, convenient and quick. Life waterproof: IPX4 waterproof design, no fear of wind and rain, free travel. Specifications: Material: aluminium alloy + ABS Battery: 3.7V, 350mAh Chargings times: about 2 hours and 20 minutes Chargings current: 5V, 280mA Waterproof: IPX4 Modes: manual / automatic Item size: 31 * 28 * 31mm / 1.2 * 1.1 * 1.2in Item weight: 29g / 1.0ounce Package size: 100 * 50 * 50mm / 3.9 * 2.0 * 2.0in Package weight: 73g / 2.6ounce Packing List: 1 * Tail Lamp 1 * USB Cable 1 * Manual 1 * Installation Accessories Set