At least one AT101 Remote Monitoring Hub is required per system. This unit receives wireless sensor data from up to 30 different AT200 sensors and will serve them up on a webpage. Data will be sent to a cloud server at no charge, and the webpage charting software will layout all data points. Alert emails can be sent based on data level presets. You can also transmit via XML data to a server. Network connection is 10baseT RJ45.