Product description 4 Lighting Modes - Full Brightness / Chase Mode / Quick Chase Mode / Flashlight Mode. Simple control button conveniently located on top of the light for easy access. Click the button to change light modes and cycle through the light modes to TURN OFF. Smart charging ensures longer battery life - Automatic, fully charged cut - off system. 1.ADVANCED DESIGN The Tail Light is built in 330 mAh rechargeable lithium battery. AllowablePower bank or any device with a USB port use. 2.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. 3.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. 4.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. 5.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. 6.IPX5 WATER RESISTANT Highly airtight construction - strong and waterproof. These tail lights are water resistant for any weather, and extremely durable. Package Contents: 1 X Tail lights 1 X USB cables 2 X Silicone Mounting Straps 1 X Instruction Manual