【MULTIFUNCTIONAL SAFETY LIGHT】 Easy to install. Lightweight and durable bike tail light that can be mounted on all bikes, children's bike, adult bicycle, handlebars, seat posts, dog collars or anywhere. It also can be used as helmet lights, backpack lights, warning lights and more.【5 LIGHT MODE OPTIONS】 This bike laser tail light with 5 modes: Red highlight / Red weaken / Red fast flashing / Red slow flashing / SOS flashing. You can switch different modes according to your needs and different occasion. (Highlight mode can be used for 6 hours, low light mode for 10 hours.)【USB RECHARGEABLE】 Built in USB charge port for this bike rear light (USB cable included). The rear bike light can be charged on your computer or any device with a USB port. Only takes 1.5 hours to fully charge. NOTE: This bike rear light need to charge before the first use.【WATERPROOF BICYCLE TAIL LIGHT】 The taillight is made of IPX5 rated water resistant material to ensure a safe use in heavy rain.【EASY TO INSTALL AND REMOVE】 Quick release rubber strap, you can take it off or put it on at anytime and anywhere, which will effectively prevent the theft. If you like cycling trip or hiking, this bike laser tail light will be the essential in your journey.