FOUR LIGHT MODE OPTIONS: The tail light feature an one-touch switch with four different lighting modes depending on your preference, include full brightness, half brightness, fast flashing and slow flashing.ADVANCED DESIGN: The tail light is built in 330 mAh rechargeable lithium battery, it comes with a charging cable that charges from your computer, power bank or any device with a USB port.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.WATERPROOF: Waterproof and dustproof, water spray from any direction will not enter the light even in big rainning.EASY 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.