If you have a mobile setup you know all too well that battery voltage will drop quickly, especially once the engine is turned off. This is why it is important to have the MFJ Super Battery Booster (MFJ-4416C). This easy to use battery booster will keep your radio running so you don't miss that once in a lifetime QSO. As the voltage drops in your battery, your radio can become distorted or will shut down at the worst possible time. The Super Battery Booster prevents that from happening, allowing you to stay on the air longer.