Alarm.com (XT-510-US-VZ) Simon XT/XTi LTE Module (Verizon)The Alarm. com (XT 510 US VZ) Simon XT XTi LTE Module (Verizon). Features: LTE Module for Simon XT, XTi, and XTi 5 enables wireless reporting of all alarms and other system events from the Interlogix Simon XT, XTi, and XTi 5 control panel on the Verizon LTE wireless (cellular) network. Can be used as the primary communication path for all alarm signaling, or as a backup to a telephone line connection to the central monitoring station. Alarm signaling