?Handy trckball mouse Relacon wireless connection model. It releases mouse operation from your desk and works PC operations in your hand. ?This is the best for watching videos and web browsing while relaxing on a sofa or bed. ?Use it your right/left hands because of the symmetory design. The right/left buttons and media control buttons are placed at optimal positions for easy handling. ?Optical sensor equipped with a reflective lens that is optimal for the smooth clear coating surface of the trackball is used to achieve pointer tracking. ?Operation feeling improved by adopting a large artificial ruby ??with a diameter of 2.5mm for the support ball. ?By increasing the diameter of the support ball, it is difficult to be buried in garbage such as hand dust, reducing the frequency of maintenance. ?Equipped with media control buttons convenient for watching videos. ?Play, pause, volume up and down, and track operation are possible. ?A total of 10 buttons are installed, and you can assign your favorite functions to all buttons. ?Button function assignments can be changed using Mouse Assistant, which can be downloaded for free. ?The movement speed of the pointer can be switched in three counts: 500/1000/1500 count. ?The wireless receiver is a small size that you can carry around inserting in your laptop. ?The receiver can be stored in the mous. It is convenient to carry and prevents the receiver from being lost. ?There is a power switch on the side of the main unit to prevent battery consumption when not in use. ?Equipped with a battery level indicator lamp. ?Supported models: Windows OS, Macintosh OS with a USB interface ?Supported OS: Windows 10, Windows RT8.1, Windows 8.1, Windows 7, macOS Mojave (10.14) ?Radio frequency: 2.4GHz band. ?Reading method: Optical sensor method. ?External Dimensions: 4.1cm/1.6inch (W) ×11.2cm/4.4inch (D)× Height 5.7cm/2.2inch (H)