How to Use: 1. Put the battery into the battery compartment and turn on the mouse switch 2. Insert the USB receiver into the computer interface and you can use it Specification: Item Type: Wireless Mouse Material: ABS Battery Specification: 2 x AAA Battery (Delivery Without Battery) Number of Keys: 4 (Keys) IC: 3205/A3000 DPI: 800/1200/1600DPI Button Life: 3,000,000 Times Supports System: For Windows,for OS X,for Smart TVs,for Set-Top Boxes, etc. Package List: 1 x Wireless Mouse 1 x USB Receiver Note: Delivery Without Battery