This USB rechargeable bycicle tailight with anti-theft alarm and three flashing modes is great for cycling at night or in places where visibility. With waterproof design, it makes your riding freely regardless of rain. Remote controller allows you to set and cancel alarm, adjust the light mode and set alrm ring easily. It can be easily mounted on the bike to decrease security risks in the process of riding. A great assistant for mountain bike cycling enthusiasts. Features - LED COB high brightness beads, 3 light modes with fast flash, moderate flash and steady on, easy to be noticed at night and area with low visibility. - Easy to mount with mounting holders, gasket, fixing belts, hex wrenches and mounting screw. - Ultra-high 120 db alarm. The alarm sound up to 120 decibels, once the has a touch vibration, it will strident alarm sound. - With key fob controller, it makes easier and more convenient operation. - Ip67 waterproof rate, weatherproof for you to ride freely. - Long standby and working time. Charging for 2-3 hours, stady on for 12 hours, normal working up to 15 days, standby up to 30 days. - This product does not include remote control. Specifications - Color: Black - Light color: Red - Material: Plastic - Size: Approx. 9 x 4.5 x 2.7cm/ 3.54 x 1.77 x 1.06 inch (LxWxH) - Mounting Placement: Seatpost - Power supply: USB charging - Battery: 700mAh, 3.7V Lithium battery - Remote controller battery: 12vV 27A battery - Alarm Sound: 105-120db - Lamp beads: COB bright light source - Application: Bike / mountain bike - Applicable models: Normal installation is for saddle bracket width distance 5-7cm (Any bike model and sizes) - LED modes: fast flash, moderate flash, steady on