This is an electronic board with an on-board GSM modem. The purpose of this device is to open an electronic gate by means of a GSM phone. It has a door open relay whose contact has to be connected in parallel with the button which opens the gate. It has a white list of regular user numbers who are enable to open the phone. up to 2000 and also it has up to 150 number for specified numbers. When it receives a call, it will check to see if the calling number is in the list. if it's in the list it will reject the call(so it will be FREE CHARGE to your mobile) and click the relay momentarily. Also it also has two alarm input for the security detection including the intruder detection alarm and gate problem alarm.
It is really convenient to arrive in front of your house when the gate is already open, without having to wait in the middle of the road.
* 1 x 1CH GSM gate opener(GSM 850/900/1800/1900MHz Quad Bands,Worldwide usage!) * 1 x Internal very good gain,specially designed GSM&gprs antenna * 1 x Retail water proof Packing Box