Philips VTR8000 User Manual page 79

(4) Voice-activated Recording
This is a practical function of recording, no button operation is
needed. When the function is enabled, in the course of recording, if
no voice is detected, the device will automatically pause recording
after 3 seconds; if voice is detected again, the device resumes
recording. See the below related reference picture:
(5) The Listen In function
After activating the Listen In function, you can connect an earphone
to listen if there's any sound input. See the Listen in function setting
interface picture as follows:
(6) Automatic file splitting
When recording, the device will automatically save the recording file
every 30 or 60 minutes, and then continue the recording. See the
below related reference picture:
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