1The GSMAUTO 4G version is a wireless remote switch that can be controlled by a 4G mobile phone.By purchasing a SIM card and a payasyouuse (PAYG) plan from a local wireless provider, you can connect to a 4G or 3G or GSM cellular network. After installing the SIM card into the SIM card holder on the top of the GSMAUTO 4G module, it will have its own unique phone number, which can be activated by typing in its mobile phone number. Or, you can send SMS text messages to the devices phone Number to activate each relay. 2The unit cannot answer voice calls, but when a call is sensed, its logic will activate one or two output relays in a preprogrammed sequence. Since the device does not answer the call, the activation of the relay will not affect the PAYG plan or the caller. For any call charges, it will recognize the authorized phone number and reject the call and answering. 34G design, can work anywhere in the world through 4G, 3G and GSM Net, GSMAUTO unit controls 2 independent switches. Therefore, you can control 2 separate devices from one device. An example is in an aircraft hangar, turning on the battery charger and engine preheater in sequence to prepare the aircraft for flight. 4The secure caller ID allows to control the access of up to 100 authorized users. The user's phone number is added to the whitelist. Only the numbers in the whitelist can activate GSMAUTO. You can use text to add and delete user messages as needed. 5GSMAUTO has two independent relays. They have normally open and normally closed contacts. They can be programmed to open between 1 second and 18 hours. In addition, the delay time between relay 1 and 2 switching can be set by sending a text message to GSMAUTO, once programmed, you only need to call the unit to activate the programmed relay operation. Similarly, program the unit by sending a specific SMS text command. 6By sending a text message command to the device, you can temporarily cancel the programmed operation and open the relay for up to 18 hours. When the relay is open, a confirmation text will be returned, and when the relay is closed, another confirmation text will be returned. You can also send GSMAUTO to permanently open or close the relay, send a short message, and return to confirm the short message again. 7The onboard clock and 24hour timer (each relay has 8 time periods) enable the relay to be turned on and off within the set time, for example, set relay 1 to 0600 (6 am) and 1900 (7 pm) ) Will open. The timer function repeats once a until reset. When the 24hour timer is enabled, the caller ID and priority functions will be disabled, and the onboard battery can be used for power failure alarm (battery not included). 8Applications include remote control of heating of holi houses, lighting, engine preheaters, aircraft engine heaters, irrigation systems, water well pumps, pumping stations, cabin heaters, resetting of remote servers, arming and disarming security systems, and doors Access control and garage door.