Telephone Recorder / Close Speaking Microphone
Inner Ear system, suitable for mobile phones and digital voice recorders.

To use; plug the pickup into the microphone jack on the digital voice recorder.  Place the earphone into the ear, set the machine into record mode.  Use the phone / handset across the same ear - both voices will be recorded.

The TP7 can also be used as a "close speaking" microphone (plugged into the microphone jack on the recorder).