USB Trackball Mouse GM-TB001B - Model: GM-TB001B - Connection: USB - Number of Buttons: 3 - Features: For use from lying down to presentations, etc. Cable Length: 155 cm Weight: 90 grams Thank you for viewing. I purchased this mouse when I was looking for one for presentations, and I bought several at the time. This is one of them. I remember that I hardly used it because I was using several similar ones. There were no problems with the mouse operation online. This is a trackball hand mouse, so if you are interested, for presentations, lying down, etc., it connects via USB. Please consider it.