1) Free charges. The call from authorized number then carry ’s out the turn ON / OFF 2) Control 2 devices (Gates, bollards, barriers, garage doors, shutters and access doors or machines); 3) Secure-Using caller ID for identification, unknown callers are ignored; 4) Can be operated from anywhere, no distance limit; 5) Call in to be users in 30 mins when the storage mode start, or admin send SMS to add / remove the users. 6) Up to 1000 authorized phone numbers can be configured; 7) Two Digital inp