This came packaged with a new Onkyo TX-NR747 4K receiver. It was only used once to set up the receiver and then was put into a drawer for storage. I tested it on a different model and it worked fine. This ONKYO Calibration Microphone is an essential accessory for those who want to achieve the best sound quality from their audio systems. It is specifically designed for use with Onkyo and Integra receivers and can be used with a variety of models, including TX-SR444, TX-NR636, NR646 TX-NR747, and TX-NR535. This microphone is perfect for calibrating your audio system to ensure that you get the best possible sound quality. With this calibration microphone, you can adjust your audio system to suit your needs, whether youre looking for crisp highs, rich mids, or deep bass. It is compatible with a range of Onkyo and Integra models, making it a versatile accessory for any home audio system. This microphone is an essential tool for anyone who wants to get the most out of their audio system.

ONKYO Calibration Microphone For TX-SR444, TX-NR636,NR646 TX-NR747,TX-NR535 used

See pictures. Some marks and signs of wear. Works, has some crackling in use, appears to come from cable jack, when this is held crackles reduce. Please see pictures for more information as they form the bulk of the description. Will combine postage