Kensington Si650m Wireless Notebook Optical Mouse for PC or Mac K72256US Product Description Kensington Si650m Notebook Wireless Optical Mouse - mouse Device Type MouseConne Wireless Receiver USB wireless receiver - NOTE: THIS PRODUCT CANNOT BE SHIPPED TO MASSACHUSETTS OR DISTRICT OF COLUMBIA (WASHINGTON, D.C.) Movement Detection Technology Optical Movement Resolution 1000 dpi Features Rubber side grips, scrolling wheel (4-way), battery indicator Battery AA type Device Type Mouse - WARNING: The solder used in this product contains lead, a chemical known to the State of California to cause birth defects and other reproductive harm. Please wash hands after handling internal components and circuit boards and avoid inhalation of fumes if heating the solder.