Ultra Bright to Keep You Safe - Ultra bright LEDs ensure board visibility whether you're running, biking, skateboarding or hiking, attach these lights to your helmet, stem saddle or handlebars, vertically or horizontally with a simple smart strap to keep you secure. USB Rechargeable - Built-in high quality lithium-polymer battery, only takes 2.5 hours to fully charge, strong light mode working time is up to 5 hours in the most visible mode. 6 versatile tail light modes: 1 normal light, 2 high light, 3 low light, 4 fast flashing, 5 fast normal light, loud flashing alarms. You can adjust different light modes according to your needs. Easy to Install and Use: Adjustable strap length makes it easy to install on bike handlebars, seatposts, skateboard, scooter, stroller, wheelchair, or anywhere where you can imagine. Guarantee: High quality and durable, IPX2 waterproof. Do not hesitate to contact us.