Product Functions GSM Gate, Barrier, Shutter, Garage Door and Door opener Open gate or garage door with a FREE call from your mobile phone! Remote switching machines ON/OFF with a FREE call from your mobile phone! Remote monitoring the Gate, Barrier, Shutter, Garage Door OPEN/Close Status! Remote checking the Gate, door open historical data with timestamp over GPRS network! Operation GSM controller is a remote control device which can be operated via GPRS. You can remotely control gates, garage doors and barriers via mobile phone from anywhere in the world.