A8 Remote Control Anti Thief Smart Bicycle Light IPX5 Waterproof USB Rechargeable Cycling Security Bike LED Tail Lamp with AlarmThe new smart bicycle taillights incorporate intelligent design, intelligent brake induction technology and wireless anti-theft technology. It is not just a bicycle taillight, it also has a wireless alarm anti-theft function, which not only can protect your travel safety at night, but also find your bicycle to prevent theft through the wireless alarm function. This taillight is very cool both in appearance and quality. SpecificationsNet weight: 88gColor: BlackMaterial: Aluminum PC + ABSBattery Capacity: 800mAhRemote Control Distance: 10-50 meters, can pass through the wallRemote Control Battery: 12 / 27A alkaline batteryRemote Control Size: 58x35x15mmApplicable Models: Unlimited bicycle models and sizes Features【Intelligent brake induction technology】The brake sensor design is adopted, the induction is sensitive, the tail light automatically lights up during braking, and is visible from a long distance, which can attract the attention of the vehicles behind and ensure your safety.【Intelligent light-sensing technology】In the "fast blinking and breathing" mode of the light sensor, the flash will automatically turn on at low brightness and turn off under high-intensity light. Highlight COB lamp beads, three modes.【Alarm anti-theft】In the alarm mode, any touch, knock, vibration, the tail light will be detected and the alarm will be issued 2 times immediately, and it will continuously alarm for 30 seconds. It can reach 105-120db each time.【Radio bell function】Press the bell button on the remote control, you will hear the ringtone of "di..di..di", long press the bell button for 5 seconds, you can switch between 3 different modes: "Sirens," "Twitter," and "Electric Bell"【USB charging and IPX5 waterproof】Support 2A fast charging, the longest battery life is up to 40 hours. Whether it is rainy or snowy, the taillights can work normally and escort your trip. Packing List1 * Rear Light1 * Remote Control And Fixed Base1 * Saddle Mount1 * Seatpost Fixing Bracket1 * Cable Tie1 * USB Data Cable1 * Tools And Screws1 * Gasket1 * Instruction Manual Order TipsUse model: Normal installation is suitable for bicycle saddle bracket width distance 50-70MM (unlimited bicycle model and size)Please use the battery for the first time to protect the battery life.