1. [Built-in buzzer] Each bicycle light is designed with a unique buzzer to remind others to pay attention to safety. Our bicycle lights can easily illuminate the road ahead and guide the way, while warning vehicles and pedestrians behind. 2. [USB rechargeable] Our front and rear bicycle lights are equipped with built-in rechargeable lithium batteries. They can be charged anytime and anywhere using any device with a USB port. Say goodbye to disposable batteries, it's convenient, fast, and cost - saving. (One micro USB cable is included as a bonus.) 3. [Multiple modes] Three super - bright front lighting modes combined with five eye - catching rear lighting modes allow you to use them effectively in different environments. The bicycle light set can emit stable and bright light, improving visibility at night and protecting your cycling safety in all aspects. 4. [IP65 waterproof] This front and rear light set is made of high - quality waterproof materials with a protection rating of IP65, suitable for various weather conditions and outdoor use. It ensures visibility even in extreme weather conditions, guaranteeing your cycling safety. 5. [Widely used] It can be used not only as a bicycle light but also as an emergency flashlight, camping light, step light, or helmet light for other night - time work. The front and rear lights can be easily installed on most standard handlebars within seconds. 6. Different modes: Our front and rear bicycle lights have different brightness modes. You can easily switch between different modes by short - pressing the switch, fully meeting the lighting needs of various occasions. 7. Cyclic charging: This is an excellent value bicycle light set. It can be charged anytime and anywhere with a simple USB data cable. It is equipped with a 1200mAh battery with a long battery life. 8. Attractive appearance: Each stylish bicycle front light has a practical small speaker, which can comprehensively protect you, yourself, and others during outdoor cycling.