The Sony ECM-90 Electret Condenser Microphone is an ultra-compact, dual-diaphragm omnidirectional microphone capsule.

The ECM-90 has a flat-and-wide frequency response of 20 Hz to 20 kHz, a dual-diaphragm mechanism that reduces the cable noise and a splash-proof design built to withstand every-day use.

The ECM-90 is available with two different connectors

ECM-90BC comes with a Sony 4-pin (SMC9-4P) connector

ECM-90LM comes with a 3-pin Lemo connector