AMIR Wireless Vertical Mouse, 2.4G USB Ergonomic Mouse High Precision Optical Mouse for PC/Desktop/Laptop/Mac, Adjustable 800/1200/ 1600 DPI, 5 Buttons - Dark Black A tip You must be aware of before using; the wireless receiver is plugged at the bottom of the mouse; Please make sure it has been taken out and plugged into your devices; The USB cable is used to charge the mouse, not for connecting the mouse with devices Rechargeable; powered by built-in Rechargeable lithium battery instead of disposable batteries, you can charge the battery via the USB charging cable(included) when the battery level of the mouse is depleted; this eco-friendly product can last a Month after fully charged Adjustable DPI; one button to select adjustable DPI resolution/1200/1600), you can conveniently change the cursor speed to suit different scenes Extra functional buttons; with the added forward/backward buttons, you can browse web pages and documents faster; side-pressure right and left buttons are designed with balanced symmetry, and the delicate and three-dimensional scroll wheel is designed with a non-slip texture Sleeping mode; the secondary sleeping mode can save energy effectively; If you forget to turn it off or do not use it for a long time, It will automatically turn to power saving mode; and any button to wake it up at any time