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How to use 1. Put the batteries in, and take the dongle (usb receiver) out, which is in the battery compartment of the mouse. 2. Insert the dongle (usb receiver) into the computer USB port. 3. Turn on the mouse power switch at the reverse side of the mouse. When the mouse pointer appears on the computer screen, move your wireless optical mouse to check it works. 4. Allow a few seconds for installing, no action needed, just wait. Then you can use the mouse Features 2.4GHz wireless technology provides a powerful and reliable connection up to 33ft/10m. With Mini Nano receiver, take it away any time you need to. Simple and practical, it meets your daily needs for your office and home. Technical Details: USB interface: USB2.0Wireless technology: 2.4 GHZ Power source: 2pcs AAA Batteries (Not include) Working type: Optical Warm Tip: After being tested, we found that color might seem a little different (lighter or darker) on different monitors. After-sales Service: 1. 30 days warranty by Liili. Free return of or replacement within supported if defective. 2. "Your satisfaction is our highest priority". If you have any problems about this product or your order, please feel free to contact us. Contact Us: Log in Amazon account>find the order>click "Get help with order">choose specific subject>click Ask Seller.