Sony ECM-AW3 Wireless Microphone - Silver (Discontinued by Manufacturer) Wireless Microphone Uses Microphone Input Jack Capture crisp, clear audio from up to 150 feet away IInteractive Communication Two-way communication, up to 150 feet from the camcorder Shoot while still talking to each other Microphone and receiver unit are equipped with earphone jacks Continuous operating time: approx. 3 hours