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Siemens A55/ C55/ M55/ S55/ SL55/ A56/ C56/ CT56/ S56/ SL56 cell phone audio adapter allows a 2.5 mm female receptacle for a standard "universal" hands free headset to work.This is the 2.5 mm audio jack adapter piece only, and not the 2.5 mm universal hands free headset that you must supply. Just plug this audio adapter onto the bottom of your Siemens cell phone to convert the audio for use with any standard 2.5 mm jack, 2 ring, 3 connector, audio device.Important: Not compatible with headsets using a Microphone Volume adjustment, or a Microphone Mute feature! Headsets that have the Earpiece Volume adjustment, but no Microphone Volume adjustment will work. Click on the Hands Free Head Sets compatible with these audio adapters & sold separately!