Advanced design. It comes with a charging cable that can be charged from a computer, a power bank or any device with a USB port.Four lighting mode options: The tail lamp has a key switch, and there are four different lighting modes according to your preferences. Including strong light, slow flash, burst flash, fast flashEasy to install: With a convenient one-button disassembly button, you only need to slide the lamp in or out of the base without removing the entire mounting bracket. The silicone mounting strap of the taillight is designed with four openings, which fits most handlebars and seatposts closely.Riding safety: The taillight emits a striking wide-angle beam, which can be seen from the distance of the block, so there is no need to worry about being knocked over by others.4 light mode optionsStrong light, slow flash, burst flash, fast flashHow to charge1. Connect the USB cable to the USB input port of the bicycle light.2. Plug the other end of the cable into the AC adapter (not included) connected to the wall outlet or the USB port of the AC computer.Package Contents2 X tail light (red light)2 X USB cable2 silicone mounting straps for taillights