Eximtrade Mini Optical Finger Ring Mouse for Computer Notebook Laptop Desktop PC EASY CONTROL: simply hold the finger mouse like a pencil or put it on the index finger, you can use your thumb to control the buttons easily. The finger mouse can be used on any surfaces, no mouse pad is required. NO SOFTWARE INSTALLATION: plug and play, no software installation is required. COMPATIBILITY: Compatible with Windows/Mac OS/Unix/Linux ERGONOMIC DESIGN: the ergonomic design allows long time usage without fatigue. DPI: 1600 &#x2022; Dimension: 60 x 30 x 25 mm &#x2022; Weight: 32g &#x2022; Cable Length: 1.1m