... actions, this is very useful when the temperature up to appointed value, need switch on the air ... input can be used as Arm or Disarm button, the other 3 inputs can be used as ... .>>>>>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 control ...