Mercedes SL550 Wireless Optical Mouse 2.4 GHz wireless technology 3-Buttons Scroll Wheel (acts as a third button) Optical technology 800 and 1600 DPI resolution (changes when clicking left and right buttons simultaneously) Fully functional headlights with on/off switch Built-in automatic timer shut-off Low battery indicator Compatible with PC or Mac Includes a Mini USB Receiver w/stowaway capability – under the car Mouse runs on one AA battery, included Lead-free components (RoHS compliant) 1.4 x 2.25 x 4.75-inches (H x W x D) Includes Road Mice Mercedes SL550 Wireless Optical Mouse One (1) AA battery Nano USB Receiver Quick Guide