AM/FM with weather band/ USB/ Aux In/ Bluetooth / internal memory backup This radio fits most Cat machines that are 24 volt (no converter). ** Please verify the plug in the photo will connect to the plug in your machine. ** Pin 5 is not needed with this radio. This radio does not need the constant power (memory). Pin 4 should have 24 volts. If you prefer to call with questions, our number is 573 334-7894