brand new and high quality. Ergonomically designed, it makes mouse more better grip. So it is more convenient for hands than ordinary mouse. 2.4 GHz Wireless mouse with comfortable touch. Plug and play no need driver. The mouse add side button, it is conveninet to browse web. The mouse was packed by bubble wrap bag, don't worry, we had checked that the package is very safe. The dongle can be stored into the mouse neatly when it is not used Receiver storage space and carrying easily System support: for Windows 7, Vista, 98, OS, 8 Specification: Item: Vertical Mouse Type : Wireless Mouse Design: Ergonomic Mouse Colour: Black Power Supply : 2 x AAA Battery Not Included Demension: 125x65x82mm Adjustable DPI : 800-1200-1600 Button : 6 Buttons Left/Right Button, Forward/Backward Button, DPI Button, Scoller Material: ABS Notice: This mouse backward button and forward button cannot be used for Macbook and Apple Computer. This mouse has a sleep function, 3-5 minutes is normal sleep, shake the mouse can wake up, 8-10 minutes is deep sleep, need to press the left and right keys to wake up. This is opto-electronic mouse, it need to be added the mouse pad, then the mouse will work well! Package Included: 1 x Wireless vertical Left hand mouse 1x USB Receiver _x000D_