1---5 lighting modes: the clear LED indicators can show a left indicator, a right turn indicator, a steady red light, a breathing red light, a red and blue strobe, a double flash, offering a full range of visual warning effects. 2---Wireless remote control: with 4 easy-to-use buttons on the controller, the bike helmet remote control sends signals in different modes. There's no need to lift your arm to signal direction, adding safety to your ride. (Please remove the battery insulator from the remote control before use) 3---USB charging: the bike tail light has a built-in 300 mAh battery, which can be charged via the included charging cable. Charged for 1.5 to 2 hours, it can operate for approximately 4 to 5 hours. 4---Waterproof bike tail light: can withstand rain and wet weather, can be used normally in the rain, which is the best companion for outdoor cycling. 5---Easy to install: strong Velcro design, stable and will not fall off, and no installation tools are required. Installation method: 1. keep the installation area clean, 2. remove the protective paper and stick the Velcro to the helmet. Features: 40g (1pcs) Colour: Black, Blue, Red