1---5 lighting modes: the clear LED indicators display a left turn signal, a right turn signal, a steady red light, a breathing 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 removing your hands from the handlebars, enhancing safety during rides. (Remove the battery insulator from the remote control before use.) 3---USB charging: the bike tail light features a built-in 300 mAh rechargeable 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: the tail light is water-resistant and performs reliably in rain and wet conditions, making it ideal for outdoor cycling. 5---Easy installation: secure Velcro strap design ensures a stable fit without the need for tools. To install: 1. Clean the mounting area. 2. Remove the protective backing and attach the Velcro to the helmet. Features: Weight: 40g (1 piece), Available colors: Black, Blue, Red