SPEN = Statewide Police Emergency Network, or as we call it, CB radio for Cops. All of the towns in NJ have SPEN bases to talk to each other and to State Police.
MIRS = Morris Interop Radio System = All the towns in Morris County have radios in their police, fire and EMS vehicles for interop on the County trunked system.
If the other one is GMRS that would be General Mobile Radio Service, or as we call it UHF CB. Non business band and non public safety useage.