Audix - M40W-12

CEILING / SURFACE SPEAKER Miniature cardioid condenser ceiling microphone with built-in pre-amplifier with high sensitivity for remote pickup. Perfect for video conferencing, online courses, hospital rooms, surveillance and ambient sound applications. RF immunity of GSM or mobile devices. Frequency response: 60Hz-10kHz. Impedance: 150 Ohms. SNR (pond. A): 72dB. SPL Max: 130dB. Sensitivity: 3mV / Pa. Phantom 18-52V. White color. Dimensions seen: 310mm (Length). Capsule diameter: 12mm.

http://www.audixusa.com/docs_12/specs_pdf/M40_v4_0516.pdf