The Micro sized Premium Audio Technica microphone system utilizes matched set of AT898 Audio Technica microphones. The flexible, high quality lightweight shielded 55 inch microphone cable enters the mic body from the bottom. An assortment or removable lavaliere (lapel) clips are included. The two microphone cables are terminated together into high quality stereo gold plated 1/8" (3.5mm) mini plug, ready to connect to any powered stereo microphone input that provides 2-12vdc, known as "plug-in-power". These mics are a great choice for unobtrusive recordings and are the smallest, best sounding cardioid microphones available.
For use in high SPL (sound pressure level) situations, the microphones require additional power, beyond the normal "plug in power". You will need to add battery module (power supply) or Phantom power adapter (see optional items).
Here are the specs of the microphone from the manufacturer:
With Phantom Power: 131 dB SPL, 1 kHz at 1% T.H.D. With Plug in Power: 115 dB SPL, 1 kHz at 1% T.H.D.