RF-904 Rechargable Wireless Mice 1)USB|PS/2 800dpi/400dpi 2)Wireless design extend your working distance 3)256 changeable link ids 4)Let you be free from interference by other wireless mouse used nearby 5)Precise Optical Technology 6)The motion can be detected on most surfaces,including wood,plastic,paint,etc. 7)Elegance design chargable mouse stand 8)The stand still act as receiver and battery charger 9)Smart power management for power saving 10)Powerful mouse driver 11)You can choose the functions you need for the programable buttons and the scroll wheel