... electric mode overload not closed-down,the buzzer sends out alarm soundShort-circuitOutput short-circuit, a buzzer ringing, 20 seconds after ... the city electricity when in normal work,the maching without alarm,when the utility power failure,the machine is in the ... battery,a buzzer 30 seconds each tweet 4BBattery low voltage alarm buzzer two times per second,a call.Battery mode,the ...