How to use: 1.Open the car roof cover, and take out the mini receiver. 2.Insert 2 AAA battery (NOT included) with correct polarity, then open the power switch. 3.Insert the mini receiver into computer USB combo. You can use this sport car mouse directly after inserting the receiver. Product Description Interface: USB 2.0 Resolution: 1600DPI Tracking Method: Optical Switch Life: 5 Million cycles Button: Button: 3 buttons with scroll wheel Wireless Operate Distance: Up to 10M Size: About 4.1 x 1.9 x 1.4inches Applications: advertising promotions, business gifts, festivals, moving, birthday, wedding, awards commemorative, fairs, anniversary celebrations, opening ceremony, employee benefits, public relations planning Feature: Comfortable moving more stable and more accurate Optical Engine: Experience smooth and accurate tracking Lightweight, durable design: enjoy the comfort and ease available everywhere Plug and play: Intelligent connectivity,no need to code,plug it into the USB port to get started Fit the palm of your hand shape: the use of natural comfort, reduce hand fatigue. Everywhere you can enjoy comfort and relaxation Package Include: 1 Wireless Car Mouse 1 USB Receiver (Built inside) Note: 1.The mouse need 2 AAA batteries (Not included). 2.About the led light, only have the blue headlights, as it has no individual switch for the LED light, the light is formed because of light transmission when you turn on the car mouse, so the light is not strong, it can help you save the battery power. So the light is not real light, it will not light up 3.We have tested it well before sending it out. If there is any question, welcome to contact with us, we would provide the best service for you and help you solve the problem. Thanks.