The ECM-AW3 from Sony is a complete battery-powered bluetooth wireless microphone system. It plugs into any kind of video camera or recording device that features a 3.5 mm mini-plug microphone input and allows the camera operator to communicate clearly with the subject. The mic has a range of up to 150 feet (45.72 m).
This mic system allows a subject and a device operator to communicate, while only picking up the voice of the subject and not that of the operator on the receiver end. This is useful in situations where you want to focus the attention on one subject. For example, when shooting a business presentation, the camera operator can whisper cues to the on-screen talent without being heard.
The ECM-AW3 also doubles as a two way communication system. It includes two sets of earphones that plug into each module, so both parties can clearly hear one another. A belt clip and an arm band are included (the arm band enables you to attach the transmitter to a subject that is wearing clothing that cannot accommodate a belt clip). An included carrying pouch will help to protect the transmitter.
Transmitter operates for approximately 9 hours
Receiver operates for approximately 3 hours