The CPPW 01-RF is a phantom power adaptor requiring external feed from phantom power supply 9 – 48 Volts DC. The case is made from robust aluminium and includes filters which will eliminate all interference from GSM frequencies from 800 MHz - 1.2 GHz. The internal PCB has a 3 screw terminals for input and output connections for quick and easy wiring allowing open ended microphones to be connected. A 1 Metre screened cable is prefitted to the input terminals ready for connection to a phantom power supply. Its small size enables it to be placed discreetly either in a ceiling or under a table away from the microphone itself and is Ideal for permanent installations.