5 Lighting ModesThe product has a total of five modes: red light always on + left flashing high decibel horn + red light flashing + right flashing high decibel horn + all flashing. You can change different light signal modes according to your needs. Wireless Remote ControlThe wireless remote control can be installed on the handlebar of your electric bike or scooter in seconds, you can easily activate the signal by pressing the corresponding button. Rechargeable and WaterproofThe product has a built-in large capacity rechargeable battery, you can use a computer, tablet or other methods to charge your taillights via USB interface, easily and quickly. Additionally, our system is IPX4 waterproof certified, even riding in the rain without any stress. Easy to Use and InstallOur flash is suitable for all types of seat posts or luggage racks, and the quick release function of the bicycle tail light allows you to install the flash and remote control in 30 seconds. In addition, there are only 3 buttons on the light, which is easy to operate and minimizes reaction time, which is beneficial to driving safety. SafetyUpgraded LED has high brightness and is visible from 100 meters away, allowing you to ride safely at night and in dim light. Additionally, the built-in audio signal alerts other road users and pedestrians of your presence so that pedestrians can predict your lane changes for your own safety.