90 defense zones study codes security alarm dial system:
1.Siren / mute siren and continue dial your pre-set 6 groups of Tel No. at first time when an accident(theft,gas leakage, smoke accumulation danger ect) happen.
2.In prior to call your preset tel, even another call already coming or someone using the telephone .
3.Faraway control by telephone under password protection to operate the system such as arm, disarm, activate siren, shut siren, hear what happen ect.
4.Can work with gas leakage[...]