Small Wireless Mouse for Laptop, Computer, Mac, ChromebookHow to Use:1. Put in the 2 AAA batteries, take the dongle (usb receiver) out, which is in the battery compartment of the mouse.2. Insert the dongle (usb receiver) into a USB port.3. Turn on the mouse power switch at the back side of the mouse. 4. Allow a few seconds for installing, no action needed, just wait.Technical Details:Wireless technology: 2.4 GHZ, up to 33ft/10mWorking type: OpticalUSB interface: USB 2.0 Power source: 2 AAA Batteries (Not included in package)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 Maizi. Free return 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.