... 45~55HzCoverage area800SqmSize29*18*5cmNet Weight 1.37KG A High-gain linear power amplifier B ALC technology ... base station dose not cause an increase in background noise ,but will not lead to a decline in the ... signal Complaints areas ,such as conference rooms ,a small supermarket,small shopping malls ,the office ... ,etc.D Elevator ,lift wells in particular ,not in the lift cables laid E,Home ,office ...