... time. A relay with dialing-in remote control. Up to 10 tel. numbers can be authorized for ... actions, this is very useful when the temperature up to appointed value, need switch on the air ... .>>>>>Mainly Features of the GSM Controller RTU5010/RTU5011:>>UP TO 8 NC/NO inputs, connect dry contact ... New Upgrading,GSM SMS Controller,RTU5011,Temperature UP DOWN remote control,24V DC Switch,NC NO sensor control ...