Honeywell XENON 1902 - Manual (Page 104)

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If there are no trigger pulls during the timer interval, the scanner goes into
power down mode. Whenever the trigger is enabled, the timer is reset. If
the scanner is placed in the charge base cradle and the battery is in the
process of being charged, the scanner will not go into power down mode.
Default = 3600 seconds.
Note: When the scanner is in power down mode, pull the trigger to power
the unit back up. There will be a set of power up beeps and a delay
of up to a few seconds for the radio to join. The scanner will then be
ready to use.
0 seconds
200 seconds
400 seconds
900 seconds
* 3600 seconds
7200 seconds