Sony ECM-999 

With a selectable stereo image, single "AA" battery operation, and a built-in low cut switch, Sony's ECM-999 Stereo Electret Condenser Microphone is ideal for a multitude of recording and broadcasting applications. Other features include a single-point stereo pickup and an MS design with 3 electret condenser capsules for stereo recording with a single microphone.

Features:

MS design with 3 electret condenser capsules for stereo recording with a single microphone
LED battery check lamp, Variable stereo angle (0° to 150°), Low-cut filter, battery operation,

20 to 20,000 Hz, -48.0 dB - 104 dB, equal to or less than 130 dB SPL