... 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 ... Samchinese New Upgrading,GSM SMS Controller,RTU5011,Temperature UP DOWN remote control,24V DC Switch,NC NO sensor ...