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2. Wireless microphone - Wikipedia

   en.wikipedia.org/wiki/Wireless_microphone

   A wireless microphone, or cordless microphone, is a microphone without a physical cable connecting it directly to the sound recording or amplifying equipment with which it is associated. Also known as a radio microphone , it has a small, battery-powered radio transmitter in the microphone body, which transmits the audio signal from the ...

3. Phantom power - Wikipedia

   en.wikipedia.org/wiki/Phantom_Power

   Some condenser microphones can be powered with a 1.5-volt cell contained in a small compartment in the microphone or in an external housing. Phantom power is sometimes used by workers in avionics to describe the DC bias voltage used to power aviation microphones, which use a lower voltage than professional audio microphones.

4. Baby monitor - Wikipedia

   en.wikipedia.org/wiki/Baby_monitor

   Portable battery-operated receivers can be carried by the parent around the house. The transmitter stays near the infant crib and is usually plugged into a AC socket. Some baby monitor packages include two receivers. Baby monitors may have a visible signal as well as repeating the sound.

5. Electrolarynx - Wikipedia

   en.wikipedia.org/wiki/Electrolarynx

   The most common device is a handheld, battery-operated device pressed against the skin under the mandible which produces vibrations to allow speech; [1] other variations include a device similar to the "talk box" electronic music device, which delivers the basis of the speech sound via a tube placed in the mouth. [2]

6. Microphone - Wikipedia

   en.wikipedia.org/wiki/Microphone

   Condenser microphones require a power source, provided either via microphone inputs on equipment as phantom power or from a small battery. Power is necessary for establishing the capacitor plate voltage and is also needed to power the microphone electronics.

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