2.4G NOISELESS WIRELESS MOUSE PLUG&PLAY Nano USB receiver Noiseless click Power saver Durable quality: 5 million keystrokes tasted, 15M/45ft reliable connection, Accurate and high optical tracking precision. Smart power-saving management: Up to 18 months standby. Low consumption mode triggers at 3 sec & 1mins. Auto sleep mode triggers at 30 mins. Noiseless clicking: Keep your work efficiency without disturbing others. Dpi adjustable: Adjust mouse sensitivity using the DPI button anytime (800-1600DPI). Comfortable design and fashion style: Streamlined Appearance, mini and portable Ergonomic design: More suitable for hand. Type: 2.4Ghz Wireless Certification: CE Gross Weight: 85g DPI: 800DPI, 1200DPI, 1600DPI adjustable Operation Mode: Opto-electronic Number of Buttons: 4 Power Type: Battery Hand Orientation: Both Hands Operation systems: Windows 2000, Me, XP, Vista, Win 7 and Mac