With wireless transmission, the longest transmission space is 10 meters. The wireless mouse has a mini compact size, which is easy to carry. With ergonomic design, it is comfortable to use. It is compatible for Windows 98 SE/SME/2000/XP/2003 and for Mac-OS. Item Name: Wireless Mouse Material: ABS DPI: 1000 Battery: 1 x AA Battery (Not Included) Transmission Space: 0-10m Wireless Transmission Frequency: 2.4GHz Compatible Systems: for Windows 98 SE/SME/2000/XP/2003, for Mac-OS Interface: USB Features: Wireless, Portable, Computer Accessory Size: 10cm x 6cm x 3.3cm/3.94" x 2.36" x 1.3" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Wireless Mouse 1 x USB Receiver