Features: 1.Multifunctional: Used as a bicycle tail light and brake light; with antitheft alarm function, it can scare off thieves and protect the bike. 2.Bell Button: The taillight is equipped with a remote control. Press the bell button on the remote control to remind surrounding pedestrians and vehicles to avoid it. 3.6 Warning Mode: Press the remote control light key to switch the tail light mode, red light: slow flash, breathing, burst flash, always on; yellow light: emergency double flash; yellow light: tail light off (animation effect). 4.High Sensitivity: Through the dual mode of light sense and vibration, it can recognize whether the bicycle is in use, and the lights will automatically flash when riding at night, no need to switch. 5.Smart Mode: Automatic slow flashing or breathing mode, the taillights will automatically detect the brightness of the riding environment after 30 seconds of lighting, and automatically light up when it is dark. 6.Durable Construction: The bike brake light alarm is made of PC material, which is waterproof, dustproof, resistant to high and low temperature, and can be used for a long time on the bicycle. Specification: Item Type: Bike Alarm Tail Light_x000D_ Material: PC_x000D_ Alarm Battery: 1 x 18650 3.7V 2000mAh lithium battery(built in_x000D_ Standby Time: 4-8 months_x000D_ Charging Interface: Standard USB 5V_x000D_ Remote Control Battery: 1 x CR2032 button battery 250mAh (built in)_x000D_ Standby Time: 3-5 years (30 times a day)_x000D_ Operating Frequency: 433.92MHz_x000D_ Wireless Range: Approx. 30-60m/98.43-196.85ft_x000D_ Working Environment Temperature: -40-+60_x000D_ Working Environment Humidity: