Y-10W Wireless Trackball Mouse 3 Months Free replacement and after sale service available, please buy with confidence. Trackball mouse with scroll: Interface PS/2 or USB. Compatible System: Windows 98/ 2000 / XP / VISTA / Win7/ Win10/ Linux / Unix / Mac OS/ Android OS. Four group adjust DPI:400,600,800,1200. Effective distance within 10M. Ergonomic Design: Cordless trackball mouse can greatly ease the harm of palm joint or muscle for long time using mouse. Ambidextrous design mouse for left or right-handed users. Any questions with this product, please contact us, we will reply in 24 hours. Description: Wireless handheld mouse design, off-table use in the air, no operating space restriction, which is also suitable and convenient for living room multimedia center, convenient button controls let you able to operate when youre sitting, leaning, lying down or other body posture. Specific: 1. Left and right hand design 2. Works with ALL operating systems, like Windows version / ME / 2000 / XP /NT/WIN7/WIN10 operating systems, including MAC OS,Android OS, tablet. 3. Interface PS/2 or USB. 4. Four group adjust DPI:400,600,800,1200,default 1200. 5. Effective distance within 10M. 6. Working Frequency 2.4GHz. 7. Size: 11*6*5cm 8. Weight:120g Notice: Y-10W Trackball Mouse does not have Laser Pointer Function. If you want a mouse has laser function, please search Y-10L Trackball Mouse on Amazon. Package Included: 1 X Wireless Finger Handheld USB Mouse Mice Trackball Mouse 1 X receiver 1 X User Manual 1 X AAA battery FAQ 1, All the mouse we sell have 3 months warranty, if you had any questions, please contact us directly. 2,If the mouse movement becomes difficult, you may try to used some liquid wax to wiping it. Problem solved