Brand JianShengYiZu Model JS-W02-HEISE Quantity 1 Color Black Material Plastic Connection Method Wireless Tracking Method Optical Resolution 500 / 1000 dpi Power Supply 2 x AAA batteries (not included) Supports System Windows XP / Vista / Win 7 Other Reliable 2.4GHz wireless transmission far away from the interference of 2.4GHz Bluetooth and Wi-Fi device; You can scroll up and down or scroll side in documents and web site for the accurate controlling; Choose from low dpi for accuracy or high dpi for fast movement you can instantly switch between 500 and 1000dpi Packing List 1 x Mouse 1 x Receiver