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 design2, 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, Resolution 1200 dpi. *Four group adjust DPI:400,600,800,12005, Effective distance within 10M.6,Working Frequency 2.4GHz.7, Help prevent Musculo-Skeletal DisordersNotice:áYUMQUA Y-10W Trackball Mouse does not have Laser Pointer Function.If you want a mouse has laser function, please search YUMQUA Y-10L Trackball Mouse on Amazon.Package Included:1 X Wireless Finger Handheld USB Mouse Mice Trackball Mouse1 X receiver1 X introduction book1 X AAA batteryFA & Qá1, All the mouse we sell have 3 months warranty, if you had any questions, please contact the seller(in the package) directly instead of Amazon customer service.á2,If the mouse movement becomes difficult, you may try to used some liquid wax to wiping it. Problem solved!