Plug-in power is a method used to deliver a small amount of electrical power to specific types of microphones. This method is predominantly used with electret condenser microphones, which are popular for their compact size and high sensitivity.

These microphones are often found in lavalier (lapel) microphones and on-camera microphones. Unlike larger studio condenser microphones that require a more substantial power source—typically phantom power at +48V supplied by a mixer or audio interface—electret condenser microphones operate on a much lower voltage, usually around 3-5 volts.

It's crucial to understand that not all microphone inputs are capable of providing plug-in power. Devices specifically designed to work with plug-in powered microphones will have the necessary circuitry to supply the required voltage.

On the other hand, mixing consoles and professional audio interfaces generally do not offer plug-in power, as they are built to accommodate microphones that need phantom power. In such cases, an adapter like the VXLR Pro adapter can be used to convert phantom power into plug-in power, ensuring that your electret condenser microphone receives the appropriate voltage.

Many modern wireless microphone systems, such as the Wireless PRO, Wireless GO II, Wireless ME, and Wireless GO transmitters, are designed to provide plug-in power to microphones. 

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