1---5 lighting modes: the clear LED indicators can show a left turn signal, a right turn signal, a steady red light, a flashing red light, a red and blue strobe, and a double flash, providing a full range of visual warning effects. 2---Wireless remote control: equipped with 4 easy-to-use buttons, the bike helmet remote control allows you to switch between modes without hand gestures, enhancing safety during rides. (Please remove the battery insulator from the remote control before use.) 3---USB rechargeable: the bike tail light features a built-in 300 mAh battery, chargeable via the included USB cable. A full charge takes 1.5 to 2 hours and provides approximately 4 to 5 hours of operation. 4---Waterproof design: resistant to rain and wet conditions, this tail light performs reliably in adverse weather, making it ideal for outdoor cycling. 5---Easy installation: features a strong Velcro strap design that is secure and tool-free. To install: 1. Clean the mounting area. 2. Remove the protective film and attach the Velcro to the helmet. Features: 40g (1 piece) Color: Black, Blue, Red