USB Rechargeable Light - Built-in 330mAh rechargeable lithium battery, can be charged from any USB port. Water-resistant rated to IPX4 - Protected against splashing water from any angle.Super Bright with 4 Modes - full brightness/ half brightness/ fast flashing/ slow flashing, It has four light modes which you can easily switch between.GET RIDING SAFETY: The tail light emits an eye-catching wide-angle beam that can be seen from blocks away, need not worry about being knocked over by others. Whether you're running, walking with your dog, cycling, skateboarding or hiking, these safety lights will keep you safe and secure.Easy to Installation- With a convenient one-touch dismount button, you just need to slide the light on & off the mount without removing the whole mounting bracket. The silicone mount strap for Taillight is designed with four openings that tightly fit around most size handlebars and seat posts.