It is a wonderful tool for the people who love riding bikes.Features:Build in 40 different patterns， 5 English words and 4 custom messages.With the portable wireless message transmitter， you can change the color or pattern at any time.Upload the messages directly from PC to USB， you can get different colors.Automatic power off after 5 minutes.The final lights will keep blinking for 1 minute after the wheel stopped.Specifications:Material: ABSLight Color: ColorfulLight Number: 30 LED lightsWaterproof: IPX4KLight Battery: 3 * AAA batteries(not included)Transmitter Battery: 2 * AAA batteries(not included)Working Hour: 72 hoursItem Size: 38.5 * 5.3 * 2.2cm/ 15.16 * 2.09 * 0.87inItem Weight: 102g / 3.60ozPackage Size: 40.3 * 10 * 3cm / 15.87 * 3.94 * 1.18inPackage Weight: 236g / 8.31ozPackage List:1 * Bike Wheel Light1 * CD-ROM1 * Bracket1 * Transmitter1 * User Manual(English)1 * Box