The 263LTE is an ATandT Cellular Communicator that provides wireless communication for DMP XT and XR Series Panels. The 263LTE contains on-board LTE communications that allow alarm messages to be communicated to an SCS-1R or SCS-VR receiver over the LTE network. The 263LTE is ready for activation with SecureCom Wireless. Note: If using the 263LTE with the XR150/XR550 Series, a model 381 cable is required for connection from the cell module SMA connector to the panel enclosure knockout. 381 is included with this model.