【SMOOTH & SNESITIVE TRACKBALL】- This ball mouse wireless consists of a 40mm trackball, high-sensitive 3-dot positioning technology, and thumb control to move the cursor smoothly & accurately. Keep your wrist and mouse in one place, and reduce hand movement. A great solution for limited space, it works on flat surfaces and your leg, sofa, bed, carpet, etc. | 【ERGONOMIC TILT DESIGN】- Technical 19° tilt angle, right-hand design, easy to adapt for trackball beginners. Keep your wrist natural, and allow your arm muscles and shoulder to be relieved for all-day work. Help to reduce muscle stress, wrist pain, RSI, and carpal tunnel syndrome. Perfect for drawing, typing, working, playing, etc. | 【SILENT CLICKS & 4 DPI ADJUSTABLE】- This track ball mouse usb wireless supports 4 levels cursor movement speed: 600/800/1200/1600. Suit different tasks, ensuring accuracy & speed. Press the middle DPI button to change it faster or slower. Features noiseless click on left/right button, suitable for usage in quiet places like public occasions, libraries, meetings, cafeteriass, or at night. | 【PROGRAMMABLE WITH SOFTWARE】- The ergonomic trackball mouse is programmable for different functions. Download SANWA Trackball mouse software to customize your mouse buttons and increase work efficiency(find it in the user manual). Note: 1. The software does not work with Mac OS or Chrome OS. 2. Programmable function works when the software on. | 【VARIOUS COMPATIBLE DESIGN】- Excellent computer trackball mouse, work with Windows(DOS/V), Mac, Chrome OS systems PCs with a USB receiver. Compatible with Windows 11/10/8.1/87, mac0S 12/11/10.12~10.15, Chrome OS, and the versions below.