The ST-5030 is quick mount die-cast XLR Microphone base. (microphones optional extra) Magnetic On/Off switch for minimum noise. Special anti-slip pad .Selectable switch for all kinds of condenser and dynamic gooseneck microphones. Equipped with battery compartment for 2 x 1.5 Volt batteries to provide phantom power 19-52V when Phantom power is not available from your mixer