Executive Communication Systems Dictaphone 304931 Headset Headphone Transcribe Adapter Dictaphone 304931 headset adaptor converts a standard 3.5 mm mono or stereo headset to a Dictaphone 2 prong connection. 3.5 mm Female Mono/Stereo to 2 Prong Male 7 inch converter cable Perfect for converting your stereo or mono headset for use with Dictaphone equipment requiring a 2 prong headset.