The audio adapter allows you to connect stereo headphones (with
the standard 3.5-mm plug) to your compatible Nokia phone. The adapter allows you to listen to the FM radio or music player of your Nokia phone with your headphones or to answer or end a call. Control your music and calls remotely.

Other feature:

To use the adapter, plug the cable of the adapter into your compatible Nokia phone, and plug your headphones into the connector at the top of the adapter.
To answer or end a call, press the call key . If your phone supports voice dialing with this device, press and hold the call key when no call is in progress, and proceed as described in the user guide of your phone.
To adjust the volume, use the buttons at the side of the adapter (if this feature is supported by your phone) or use the phone keys.
To attach the adapter to your clothing, use the clip at the back of the adapter