Alarm.com ADC-SEM300-VT-AT-M Communicator For Honeywell Vista Series (AT&T)

Alarm.com ADC-SEM300-VT-AT-M AT&T Communicator For Honeywell Vista Series This model of System Enhancement model (SEM300-VT-AT) uses AT&T cellular communication. If you would like the Verizon model, click here. The ADC-SEM300 is an upgraded version of the Alarm.com SEM210-AT communicator compatible with the Honeywell Vista10P, 15P, and 20P panels. This communicator allows signal transfer from your panel to Alarm.com and/or a central station, depending on your service plan. While Alarm.com mainly focuses on intuitive self-monitoring through their customer portal or app, they also offer a reasonably priced solution for cellular signal transfer to a central station monitoring company if desired. The SEM-300 features 4G LTE cellular communication and optional broadband connectivity for a reliable connection and long-term operation. What sets the SEM300 apart from its predecessor is its ease of installation, multiple fallback cellular frequencies, and external status LED lights for