The Grundig Digta Earphone 951 is a single sided earphone/transcription headset that has a 3.5 mm jack and fits all digital dictation devices of the Grundig Digta series. The Grundig Digta Earphone 951 has a comfortable ear clip that fits any size ear. For best results with the Grundig Digta Earphone 951 record all dictations using the conference settings.