ANTI-THEFT ALARM: The cycling security alarm can make a loud sound(115 dB) to draw people's attention and deter the thieves. Distance in the open, the remote control operating distance up to 50m(164 feet), easily find your bike location through light or sound.SMART BRAKE SENSING & LIGHT PERCEPTION: Designed with the brake sensor, Automatic ultra bright brake light will automatically light up after .The bicycle light is super bright and highly visible from a distance, really catch attention to enhance your . If you drive in a dark environment, the taillights will automatically . After leaving the dark room, if the bicycle does not vibrate for , the taillights turn off automatically.MULTIFUNCTIONAL REAR BIKE LIGHTS: Easy to install. Designed with bike alarm, COB leds and 200 degree wide angle design, the led rear bicycle light will make you more visible for other road users in dark night or daytime. Keeping you safe at all times. It also can be used as helmet lights, backpack lights, warning lights and more.IPX65 WATERPROOF & USB RECHARGABLE: IPX65 waterproof rating, don't worry about splashing puddles or rainy weather. Built-in 800mAh Polymer Lithium battery comes with a USB cord that charges from your computer, wall charger, power bank or any other device with a USB port. After charging for 3 hours, the tail light can work for 20-40 hours in 3 different modes. (Slow flash-40h, Breathing flash-30h, Steady on-20h).Model: A8Remote Control Battery: 12V/27A, Alkaline batterycolour: blackMaterial: ABS+PC+Stainless steelsize: Light size: 50x43x42mm, remote control size: 58x35x15mmPackage Contents:1 x Host + Taillight bracket1 x Remote Control2 x Mounting bracket1 x Plastic Strap1 x Square gasket1 x USB Charging Cable2 x Installation tool (large+small)1 x Chinese and English instructionsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.