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".. or used indoors on standard AC current using the cable. " please don't do this! The alternative power source is using your device's 'Plug-in power'* - a small charge sent along one of the connectors - "Plug in power is typically 5 volts of dc used to power up the JFET of inexpensive condenser microphones. The voltage can be on a separate conductor from the audio or ride on the same conductor as the audio." (copied form the Shure site) *common with minidisc recorders,etc