Accessories

I got a Motorola EH20 stereo headphone with built in microphone, but mainly use it as just a headphone.

I was wondering if there was an adapter that could take the 4-pole (3 band) connector it has and 'split' it into a stereo audio (2 band) connector and microphone (1 band) connector, so that it would be more like a regular headset I could use with my computer. I've searched around for such a thing online but can't seem to find any if they do exist (or just don't know what they would be called).

Thanks.