0.0 gigahertz 1st frequency operating and 0.5 gigahertz 1st frequency operating0.5 gigahertz 2nd frequency operating and 1.0 gigahertz 2nd frequency operating1.0 gigahertz 3rd frequency operating and 2.0 gigahertz 3rd frequency operating2.0 gigahertz 4th frequency operating and 3.0 gigahertz 4th frequency operating