Wireless Mouse with adjustable DPI levels; 6 Buttons. Features reliability, ease-of-use, and user comfort. The Case Logic wireless mouse gives you fast data transmission and no delay or dropouts. Energy-saving If mouse is not used for over 10 minutes, it will turn to power saving mode to save energy. 2.4 G Wireless Transmission Technology Enjoy the fast data transmission at the convenience of the wireless technology. Compact Receiver The wireless tiny receiver can be inserted into the slot allowing for ease of storage when not used. Wide Compatibility Compatible with most system including Windows, Mac and Linux. Comfortable Hand Feeling With special processing and advanced material, this wireless mouse makes you feel comfortable. How to set CPI: Press CPI button, if the red indicator light flashes once, its CPI is 800 Press CPI button, if the red indicator light flashes twice, its CPI is 1200 Press CPI button, if the red indicator light flashes three times, its CPI is 1600 12-month limited warranty. We also have a professional after-sale service team to make things right within 24 hours. Specification: Color: Black Number of the Key: 6 Buttons DPI: 800-1200-1600 Power Source: 2*PCS AAA Battery ( INCLUDED ) NOTE: The Back and Forward Buttons are not available for Mac OS because the system itself is a closed one, not open to the public, but the other function can be used