Delux M618 Mouse is a type of wireless ergonomic vertical mouse, adopting human ergonomic design. The new griping holding method with palm rest can free user's wrist and reduce the tiredness of arm, providing comfortable feeling. 2.4G wireless office mouse, making your work more efficient.The mouse with rubber protective shell will reduce the tiredness for long time using. Specifications Version: Wireless Optical Mouse Button: Six (Left click, Right click, Scroll wheel, Forward, Backward, DPI button) Resolution: 800/1200/1600 DPI 2.4G wireless mouse, 10 meters efficient distance Polling rate: 125Hz Working Voltage: 3V Working current: 10mA Connection: USB Nano Receiver Power Supply: 2 x AAA Battery (Not included) System: Basic function is compatible with Windows XP, Vista, 7, 8, 10 Operating System Package included: 1 x 2.4GHz Wireless Mouse 1 x USB receiver