DAYTIME VISIBLE TECHNOLOGY-Did you know that 75 percent of cycling accidents happen in daytime? This rear bike lights keeps you visible not only at night but also in the daytime, keeping you and your loved ones safe all the time. ULTRA - BRIGHT TO KEEP YOU SAFE - 240 degree wide angle visual design provides more visibility than any light on the market. Whether you're running, walking with your dog, cycling, skateboarding or hiking, these safety lights will keep you safe and secure. IPX4 WATER RESISTANT - Highly airtight construction - strong and waterproof. These tail lights are water resistant for any weather, and extremely durable. USB RECHARGEABLE - This taillight can be charged by USB cable via computers, chargers or portable power banks. This will save you lots of money on batteries. EASY TO USE - Hook onto your belt, running gear, reflective vest, backpack, dog collar, harness, or anywhere on your clothing. Mount to your bicycle, helmet, skateboard, scooter, stroller, wheelchair, or anywhere you can imagine.