Motorola PR1500 用户手册

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页码 70
PR1500
27
Common Radio Features
Emergency Keep-Alive
With Emergency Keep-Alive enabled, if the radio is in the Emergency 
state, you cannot turn off the radio by using the On/Off Volume 
Control 
knob.
With Keep-Alive, the radio will only exit the Emergency state using 
one of the ways mentioned in the previous sections (Emergency 
Alarm, Silent Emergency Alarm, or Emergency Call).