GSM
Audio door entry using mobile telephone technology
4G Door entry systems using mobile phone technology, Allowing 2 way communication between occupant and visitor without the need to be home.
The new GSM systems have the following features;
- Available as a 1-8 way
- High quality speech
- Choose your own sim card
- Upto 3 numbers can be called
- Seperate control unit
- Simple SMS programming
