You can remotely switch the machine on and off by making a phone call, and remotely monitor the opening/closing status of , railings, shutters, and garage doors! It is a very simple device that can be used to authorize access control, control doors, remote device switching, parking systems. It can be used where it is necessary to remotely turn on/off systems, machines, and equipment through mobile phone calls. Simply dial the authorized user number at the designated time to open the barriers and doors, or switch the machine on or off via the GSM door opener/relay switch. Users can be authorized to operate it within the specified time, after timeout, it will be automatically changed to unauthorized type., Manufacturer: DMETE