GPRS Outdoor Alarm Controller S250; Three-Phase Power Line Protection; NC/NO/EOL Dry Contact; Remote Relay Output. Remote Monitoring Your ... on the network condition)Relative Humidity: 10 to 90%, No condensationGSM Band: 850,900,1800,1900MhzGSM Emission Power: GSM850,EGSM900 ... : AsiaGSMalarm GPRS Outdoor Alarm Controller S250,Three-Phase Power Line Protection,NC/NO/EOL Dry Contact,Remote Relay Output