Chinese factory SMS security alarm system wireless 1.watch dog feature 2.two way communication 4.Dual GSM+PSTN alarm Chinese factory SMS security alarm system wireless1 ... in, speak, sound siren, disarm remotely from users phone, when there is alarm 5.groups timed auto arm/disarm, Away/Stay arm ... , disarm, or turn on/off the siren from a remote phone " Zone is defaulted as below: 1: fire, zone 2: panic ...