The IDC 1001EM comes with a FM frequency scanner.internal MF Generator,internal antanae,internal 5w speaker and a 3.5 mm audio output jack. The Scanner and MF Generator have two seperate power supplys(2 x AA batteries) with independent on/off switches. The green toggle switch is a lighted switch for the EMF Generator. The FM Scanner has a momentary push button to start and stop the scanning session. You can use both the EM Pump and scanner one at a time or at the same time for varying results. The 3.5 mm audio output can be use for a external speaker or to connect your recorder. If you have any questions please don't hesitate to contact me.