The ADC-SEM300-VT-AT serves as a dual-path System Enhancement Module (SEM), strategically engineered to facilitate the seamless transition of compatible Honeywell/Ademco VISTA-10P, VISTA-15P, VISTA-20P, and VISTA-21iP panels to Alarm.com’s award-winning interactive services. This dual-path SEM, the ADC-SEM300-VT-AT, operates over the AT&T 4G LTE cellular network and provides an optional broadband Ethernet connection. By offering multiple paths, it ensures an extended life cycle, delivering the most secure and reliable service. Notably, the SEM has obtained ETL certification, guaranteeing a high standard of safety and sustainability.