LEFT-HANDED ERGONOMIC VERTICAL MOUSE -- Specifically designed for left-handers, it encourages healthy neutral \"handshake\" wrist and arm positions for smoother movement and less overall strain. Recommended for users with repetitive strain injuries (RSI) and users who work particularly long periods at the computer. EASY TO USE, PLUG & PLAY -- Strong and reliable 2.4GHz wireless connection, a nano USB receiver on the bottom of the mouse, just Plug and Play. The left-handed mouse dimensions: 5.0*3.0*2.5 inches. Weight: 95g. NOT compatible with Mac OS. Please confirm size and system before purchasing it. MULTIFUNCTIONAL AND CONVENIENT -- Easy access to multiple uses via 6 buttons. Advanced \"Page Back\" and \"Page Forward\" function buttons provide convenience when browsing web pages. 3-level DPI (800/1200/1600) suits both ordinary needs and gaming needs, with premium optical engine, enables faster response, smoother tracking and higher precision movement. ENERGY-SAVING MOUSE -- An independent On/Off button on the bottom that helps save energy effectively. In addition, it automatically enters sleep mode after 8 minutes of inactivity. Press the right or left button to wake it up immediately. (2 AAA batteries needed, not included) WIDE COMPATIBILITY -- Compatible with Windows 7, 8, 10, XP, 2000, CE, Vista and Linux. Suitable for Notebook, PC, Laptop, Computer and other devices. (The USB receiver is on the bottom of the mouse)