Complete set: includes front light and tail light, front light for illumination, tail light for warning, double assurance for night riding safety, one set meets all needs.nbsp;Front light has four modes: high / medium / low brightness, strobe, suitable for various scenarios like night riding, camping, flashlight use, easily switch modes flexibly.nbsp;Tail light has six modes: high / medium / low brightness, slow flash / interval flash / constant flash (double click to activate flash), it is eye-catching for warnings, ensuring safety.nbsp;Charging: no need to replace batteries, USB charging is convenient, long-lasting, worry-free for daily use and outings.nbsp;Universal and easy to install: compatible with most bicycles, simple installation, compact and space-saving, balancing practicality and safety.