Bornd E220 Wireless 2.4GHz Optical Mouse (Slim-Rainbow) Specifications Mfr Part Number: E220 Features: US Cypress RF Chipset 3 years battery life with normal use Auto Sleep/Awake button to save power Special water transfer painting technology Cellular techonology, multipoint interconnection (many connection technologies compatible with Bornd wireless mice and keyboards) Press the Left and Right buttons at the same time for 3 seconds to adjust resolution between 1000 2000 DPI Power saving function is set-up automatically every 8 minutes and is easily activated Excellent package design Mouse: Buttons: 3 (left, right, scroll) Operation Range: 30 feet, 360 degrees Resolution: 1000/2000DPI Response Time: 4ms Operating Voltage: 3V Operating Current: 3.8mA Coating: Water Transfer Painting Dimensions: 4.0 x 2.6 x 1.3 inch Receiver: Input Current: 5V DC 30mA Interface: USB 2.0 Dimensions: 0.7 x 0.6 x 0.2 inch Compatibility: Windows 98/ 2000/ XP/ ME/ Vista/ 7/ 8/ Mac OS Color: Slim-Rainbow Weight of Mouse and Package: 0.597 lbs 2x AA Alkaline Batteries (Not Included)