SANOXY 2.4GHz 1200DPI/1800DPI Car Shape Wireless Optical Mouse Gaming Mouse with USB Receiver for PC Laptop. Optical. Resolution: 1200DPI/1800DPI Button: 2 Buttons + 1 Scroll Wheel. System Compatibility: Windows 98 / ME / NT / 2000 / XP / Vista / Win 7 / Linux or Mac OS. USE: STEP 1 Hold the bottom of the car and the hood with both palms. STEP 2 Push the hood away from the front of the car to the rear of the car. Please notice if the receiver has dropped when you open it. STEP 3 Take out the mini adapter and follow the instructions to install the AAA battery. STEP 4 Plug the USB receiver into the USB port of your computer and wait until the computer reads successfully. NOTE: Please check whether the switch at the bottom of the mouse is on