Features 1 With password protection2 Can set 5 groups of control master numbers3 SMS control ON command Off Command T Command 1 ON Command turn the relay state to ONSMS Text SN Password ON2 Off Command Turn the relay state to offSMS Text SN Password OFF4 Free Call to controlUser can control the GSM controller by dial the SIM card number of GSM controller The user may hear You cant answer the phone call beep beep tone etc which mean changing the relay state successfully If the controller connected it will change to be disconnected state after a call If the original state is off it will change to be connected state after a call 5 Button ControlThe controller state will be changed when you press the SW button at side of controller If the controller connected it will change to be disconnected state If the original state is off it will change to be connected state 6 User can send sms to check the on off stateSMS text SN Password CHECK7 With Power off memory Function Specification Communication Interface WirelessItem Type Wireless Remote Control SwitchOutput Current 10AOutput Voltage 10A 220V 15A 125V 30VMax Output Power 2200WInput Voltage 9 to 12V DCInput power 0 9W Package Includes 1 x GSM controller1 x Black extension gsm antenna for strenthen gsm signal1 x Power adapter Details Pictures