The GX-60 is the Control Box that will work in conjunction with different accessories (some included) to handle - Grading 3D -Paving 3D -Excavating 2D & 3D -Asphalting 3D -Dozing 3D The GX-60 from Topcon Positioning Systems was originally introduced as a component in Topcon's X63 indicate system for excavators, but now is an integral component to Topcon's 3D-MC'sup2;. • 50% lighter than previous models • 650 MHz Celeron single-board computer • Windows XP operating system • Internal flash drive • Sealed membrane power on/off buttons • Bluetooth wireless technology • Front access USB port with dust cover There is so much these units do you woukd be better off just going to the Topcon website to look at what this unit is capable of doing. I myself dont know everything . Asking $4,500