China AC or DC Type GSM Remote Controller GSM-Key System

AC or DC type GSM remote controller,GSM-key system for gate opener system
What is GSM-KEY?
The GSM-KEY System is an advanced secured system that is based on the cellular network , The GSM-KEY system works with Caller ID and when an authorize number calls, the system will recognize the caller and open the gate, While it will not answer the call as the call will not cost anything.
How does it work?
GSM-KEY incorporates a professional industrial grade GSM engine that receives calls at its SIM number, as any ordinary GSM phone. You need to use any operator that operates in the 900/1800 Mhz band, that is the standard in most of the world, Just to give an example, if your SIM has a phone number 35674564, that is the number you have to call to open the gate.GSM-KEY has a memory where you will store the numbers of people enabled to open your gate (up to 200) When GSM-KEY receives a call, it will check the calling number and if the number is in the list you have prepared it will reject the call and open the gate.