... , hospitals, hotels, factories, villas... can all benefit from this system.GSM Mobile gate, door, garage, shutter Opener can also be used ... number, as any other ordinary GSM phone. The system operates in the GSM module quad band 850/ 900/1800 / 1900 MHZ. Just to give an example ... the password can insert or delete enabled phone numbers. The GSM Gate Opener doesn't have limitations like a normal remote ...