?Left-Hand Ergonomic Vertical Mouse?Designed for left-handed,concave area for Thumb and little extended bottom edge for pinky finger, smoother moving and more comfortable grip, less wrist strain. Recommended to Repetitive Strain Injuries RSI User and user works particularly long periods on the computer.Mouse dimensions: 4.2*2.6*2.3 inches. [Reminder: Please confirm the size before buying it.] ?Triple Connectivity?Dual Bluetooth modes provide cable-free and stable connection,comes with a 2.4Ghz USB receiver (stored in the back of the mouse)?supports Plug and Play. Just press one button to quickly swith and automatic connection among 3 devices such as Windows computer, MacBook and Android without any interference or disconnection. ?Rechargeable Battery? Powered with USB charging cable, no battery needed. Durable and Eco-friendly, 1 hour quick charge, 2 month work. ?Sensitive Click with Less Noise?3 adjustable DPI levels?1000 / 1600 / 2400?easy to change the cursor sensitivity by just pressing the DPI button,allows fast response, smooth tracking and precise movement.Quiet click with less noise, keep you stay focused on your work, no disturbing others. ?Wide Compatibility?Bluetooth mode supports Bluetooth enabled devices with Windows / Android / Mac OS system. 2.4G wireless mode supports all devices with usb port. Fits for PC, laptop, cellphone, Mac. Added forward/ backward buttons provide convenience when webpage browsing.