The CPPW 01-CV-RF is a phantom power adaptor with 6mm entry hole to facilitate microphone attachment. The case is made from robust aluminium. Inbuilt filters which will eliminate radio interference from GSM frequencies from 800 MHz - 1.2 GHz. Screw terminals for input and output connections allowing open ended microphones to be connected. 1 Metre screened cable is pre fitted to the input terminals ready for connection to an external phantom power supply. Small size enables it to be placed discreetly either in a ceiling or under a table away from the microphone itself. Ideal for permanent installations.