... from RTU5010 is the GSM Controller RTU5011with 8 Digital NC/NO inputs,8 relay drivable Outputs, 4 ... , this is very useful when the temperature up to appointed value, need switch on the ... 24 hour interval>>User-defined alarm condition (normally close or open), alarm and recovery SMS message ... Samchinese New Upgrading,GSM SMS Controller,RTU5011,Temperature UP DOWN remote control,24V DC Switch,NC NO ...