1. There are five groups of area selection, each group can control 10 independent switches of the district;
2. Bell-tone prompt control buttons with full on, full off and 4 scales are easy to operate;
3. A gooseneck microphone input, with independent key switch control;
4. Support one local audio source input, the volume can be adjusted;
5. Audio adopts balanced transmission mode, with good signal quality and transmission distance, the longest distance can reach 1KM;
6. The transmission line adopts five kinds of shielded double glue lines, and simultaneously transmits audio signals and 485 control signals, which can realize remote paging at the power switch and partition of remote control equipment.