Turn on the remote control: easy to install. Lightweight and durable rotating bicycle helmet light that can be attached to almost all types of helmets. It can also be used as a backpack light, warning light, etc. Set your own lighting mode: 6 lighting mode options: Solid Red Light Flashing Red Breathing Light Flashing Red and Blue Left Flashing Right Flashing Double Flashing. You can change modes according to your needs and different occasions to get the best lighting experience and protect yourself. USB Rechargeable & CR2032: The flasher is USB rechargeable and can be used for 4-5 hours on a 1-2.5 hour charge. The remote control can easily replace the CR2032 battery. Waterproof bicycle tail light: The tail light is made of waterproof material to ensure safe use in rainy days. Try to get yours! Note: The data is all manually measured, please allow 1-3cm error Due to differences in light and display, there may be some differences in color, please refer to the actual item received.