Activeforever Plextalk PTR2 Digital DAISY Player and Recorder - Manual (Page 38)

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6.7. Key lock - key describer function.
REMINDER: The Key Lock/Key Describer switch is located on the left side
in the recess towards the rear of PLEXTALK.
As its name implies, the Key Lock/Key Describer switch has 2 main
purposes as follows:
Firstly it can be used to lock the keys and controls so that they can't be
accidentally operated. If PLEXTALK is off when the lock is applied, the
power switch will not function. The unit will say "Key Lock" and will then
turn off again. If PLEXTALK is on when the lock is applied, all keys and
controls will be unable to function, including the power switch.
The second purpose of the Key Lock/Key Describer switch is to allow the
user to learn about the function of the keys and controls. With the lock
applied, press and hold down any key and a description of the function of
that key will be spoken. This feature is particularly useful for beginners.
To apply the lock, push the Key Lock/Key Describer switch towards the
back of PLEXTALK. If PLEXTALK is on, it will say "Key Lock Key Describer
on". No speech will be heard if PLEXTALK is off.
To unlock PLEXTALK, pull the Key Lock/Key Describer switch towards the
front of PLEXTALK. If PLEXTALK is on, it will say "Key Lock Key Describer
off". No speech will be heard if PLEXTALK is off.
6.8. Inserting and ejecting a CD.
CAUTION: PLEXTALK is only compatible with round CDs. Irregularly
shaped CDs, such as the business card type, will cause a malfunction and
should not be used.