Description: Multifunctional: This bicycle tail light equipped with an intelligent sensing system and remote control operation, usb rechargeable, features a variety of functions including bike taillight light, bicycle turn signal light, brake taillight, night warning light, anti thefts alarm, electric bellBike Taillight Light: The bicycle taillight automatically turns on in low light environments (indoors, at night, tunnels, etc.) and turns off in bright light conditions.Multiple Modes: The cycling tail light offers six different lighting modes that can be adjusted according to different scenarios to better meet your needsWaterproof Design: Made from ABS material that is waterproof and a sealed design, it can function normally even in rainy weather, ensuring use under various weather conditionsEnhanced Night Riding Security: This bicycle rear light features a turn signal function that allows you to emit directional light, effectively alerting other vehicles and pedestrians of your intended direction Specification: Material: ABS Size Chart: 13.5cmx8.6cmx6.5cm/5.31inchx3.39inchx2.56inch Package Includes: 1 Set Bike Taillight Light Note: Please allow slightly errors 1-2cm differences due to manual measurement.