1---5 lighting modes: the clear LED indicators display a left turn signal, a right turn signal, a steady red light, a pulsing 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 sends signals for different modes. No need to lift your arm to signal turns, 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: withstands rain and wet conditions, ensuring reliable performance in adverse weather, making it ideal for outdoor cycling. 5---Easy installation: secure Velcro strap design ensures stability without the need for tools. Installation steps: 1. Clean the mounting area. 2. Remove the protective backing and attach the Velcro to the helmet. Features: 40g (1 piece) Color: Black, Blue, Red