Model: MT-R545 Wireless Mouse Operation Mode: Opto-electronic Type: 2.4GHz Wireless Power Type: Battery AA*1 Interface Type: USB Key life: 5 million times Wireless distance: 10m Product Size: 100 * 60 * 39mm Gross weighT: 70±5g Resolution: 1600dpi Rated voltage / current: 3.7V / 8mA.