How Does the Cellular Repeater Work?
The repeater works with two antennas (included). The indoor antenna communicates with your cell phone or laptop data card, and the outdoor antenna communicates with the cell tower.
AT400 is for houses that have good outside signal and bad signal inside,
AT600 is for middle range in coverage and it picks up if you’re out side signal is middle range,
AT700 is for top performance if you have bad signal outside and inside,
AT800 is for maximum performance of the boosters it picks up the soft signal that network has and brings it to you for best performance

UMTS G3 this is used for internet connection  for MOBILE PHONES AND LAPTOP COMPUTERS
For enabling GSM Mobile Phone Network Access from areas with poor indoor network coverage