... It is better for one GSM alarm receiver to manage 200 to 500 GSM alarm devices. Monitoring Center Software (PH-BC110 ... can contact the family and show them the alarm message in time. 2. When there is alarming ... location of your customer. 4. When it is alarm, the monitor center will send out the map ... When it is alarming, you can press all the alarm message, including the address, telephone, name of your ...