Basically need something portable (as in carry on person), convenient (eg small), self powered, way of sending audio from 1 person to another from a 3.5mm audio jack.
A data logging device which outputs via audio (3.5mm jack) the expected output, which needs to be picked up by a guy looking at the actual outputs 10-20 meters away who needs to hear it via earpeice or headphones etc. So we currently pair the bluetooth tx/rx units, and i plug the tx into the 3.5mm jack and he plugs his earphones into the rx.
The problem is, the signal isnt great, so it keeps dropping, so need something more reliable.
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