★ ERGONOMIC DESIGN - EIGIIS Handheld Trackball Mouse can greatly ease the harm of palm joint or muscle on your wrist and muscle for long time using mouse. Good to reduce the chances for Arthritis and CTS suffers. | ★ TRACKBALL COMFORT - Hold EIGIIS Trackball Handheld Mouse in your hand like a trigger and use your thumb to move around. Sculpted shape supports your hand staying in one place, move the cursor without moving your arm.Suitable for both left and right hand - New style, no space limitation, left/right clickers, fit left and right handed users. | ★ ADJUSTABLE DPI - EIGIIS Finger Ergonomic Mouse have 800/1200/1400/1600 DPI resolution optical tracking technology that provides higher sensitivity than standard optical mice.EIGIIS wireless trackball mouse have a Sensitive rolling ball and frequency stable 2.4GHz receiver. Powered by One AAA battery (not included) | ★ WIDE APPLICATION - EIGIIS Ergonomic Trackball Mouse including USB 2.0 interface, plug and play, no software required. Suitable for laptops and desktops, but NOT for tablet. Compatible with: Windows 98/ 2000 / XP / VISTA / Win7/ Win10/ Linux / Unix / Mac / OS. | ★ WHY CHOOSE TO BUY EIGIIS TRACKBALL MOUSE - EIGIIS purpose is timely, professional and integrity. Whatever reason, If you are not satisfied with our product, you could free to contact us, we will try our best to sovle the problem. Click the "Add to Cart Button" at the Right of this Page to Order Your Set Now! Enjoy the EXCELLENT SHOPPING EXPERIENCE.