![Télécommande 3G GSM](https://i0.wp.com/gainwise.com.tw/wp-content/uploads/2019/02/SS1206-2.jpg?w=660&ssl=1)
3G GSM Access Control mainly uses 3G network. When there is no 3G network, it will change the use of 2G network. 3G GSM Access Control main function: You can call to open the door ( Access Control will Close the call to avoid the cost of). Access Control can receive SMS to open the door. It can control two door locks