The audio adapter is manufactured for the Ericsson T20, T20E, T20EC, T20S, T20SC, T28, T28Z, T29, T29S, T29SC, T39, R300, R300D, R300LX, R300zR300, R300D, R300LX, R300z, R310, R320, R320SC, R380, R520, R520M, R520MC, A2218 and A2218Z cellular phones.
In order to use a standard two ring, 2.5 headset with the above phones you will need to plug this 2.5 audio adapter into your phones audio jack and then the headset plugs into the adapter. In order to use, plug the audio adapter into your Ericsson cell phone audio jack and then the headset plugs into the adapter; for use with any 2.5mm, two ring audio headset
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