Activeforever Plextalk PTR2 Digital DAISY Player and Recorder - Manual (Page 31)

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6.3.3. Left side.
On the left side of the unit there are 4 items of note. These are:
In the recess nearest the front, from front to back, there are the
headphone socket, the external microphone socket and the line in socket.
All the sockets take a 3.5 millimetre diameter stereo jack plug.
In the recess nearest to the rear of the unit is the Key Lock/Key Describer
switch. In the position nearest to the front of the unit, the key lock is "Off"
and when pushed towards the rear of the unit the key lock is "On".