LEFT-HANDED ERGONOMIC VERTICAL MOUSE -- Specifically-designed for left-handers, encourages healthy neutral "handshake" wrist and arm positions for smoother movement and less overall strain. Recommended to Repetitive Strain Injuries RSI User and user works particularly long periods on the computer. EASY TO USE, PLUG & PLAY -- Strong and reliable 2.4GHz wireless connection, one nano USB receiver at the bottom of mouse, just Plug and Play The left-handed mouse dimensions : 5.0*3.0*2.5 inches. Weight: 95g. NOT compatibility with Mac OS Please confirm the size and system before buying it MULTIFUNCTION AND CONVENIENT -- Easy access to multiple usage through 6 buttons.Advanced "Page Back" and "Page Forward" functionality buttons provide convenience when web page browsing.3-level DPI (800/1200/1600) suit both ordinary and gaming needs, with premium optical engine, allows quicker response, smoother tracking and higher precision movement. POWER-SAVING MOUSE -- An independent On/Off switch button on the bottom which helps save energy effectively. Besides, it will automatically enter into sleeping mode after 8 minutes idle. Press right or left button for it to wake immediately. ( 2 AAA batteries needed, not included ) WIDE COMPATIBILITY -- Compatible with Windows 7, 8, 10, XP, 2000, CE, Vista and Linux. Fit for Notebook, PC, Laptop, Computer and other device. ( The USB receiver is at the bottom of the mouse ) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia