Feature: ADVANCED DESIGN: The Tail Light is built in 220 mAh rechargeable lithium battery. It charges from your computer, power bank or any device with a USB port. 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. 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. Package Included:1/2Pcs Bike Tail Light(as your choice) Note: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 2. Please allow 1-3cm measuring deviation due to manual measurement. ( 1 inch = 2.54 cm )