✅《Trackball Comfort》Elecom Handheld Trackball Mouse Has A Sensitive Rolling Ball And Frequency Stable Bluetooth Connection. Sculpted Shape Supports Your Hand Staying In One Place, Move The Cursor Without Moving Your Arm. Suitable For Both Left And Right Hand ✅《Functional10 Buttons》It Is Very Easy To Move In Any Direction. It Comes With 10 Physical Buttons On The Device And You Can Assign Your Favorite Functions To All Buttons ✅《DPI Cursor》The Dpi Button Can Easily Change Between 500(Low), 1000(Mid) And 1500(High) Dpi, Making The Movements Of Your Cursor Faster Or Slower ✅《Easy Maintenance》The Ball Rolls On Three 2.5 Mm Large Artificial Ruby Ball Bearings. They Are Extremely Smooth And The Relatively Large Size Prevents Dust And Dirt From Clogging Them. So You Don’t Have To Clean The Ball Bearings Too Often. The Ball Is Held In Place By The Ball Bearings, But Can Easily Be Popped Out Of The Device, By Pushing It Through The Hole In The Bottom And It Can Be Easily Cleaned ✅《PRODUCT DETAILS》 System Requirements: Windows 7, Windows 8.1, Windows RT8.1, Windows 10 or later, MacOS Mojave 10.14 or later, Android 6.0 or later Size: W1.6"(40.7mm) X L4.4"(111.5mm) X H2.2"(56.6mm), Weight: 77g/2.7oz (without battery), DPI: 500/1000/1500 count (switchable), Connectivity: Wireless, 2 X AAA Battery (included)