The ECM-AC2 is a condenser measurement calibration microphone with a 15-foot cable and 3.5mm auxiliary connection, designed for precise audio capture and system setup. This model serves as a compatible substitute for the original microphone supplied with Sony home theater systems and receivers including BD, DAV, HT, and STR series models. The mono condenser design enables accurate frequency response measurement and acoustic calibration across compatible Sony audio equipment. Featuring a standard 3.5mm jack, the ECM-AC2 integrates seamlessly with any device requiring this connection type for microphone input.