This document is a user manual for the ACTM-9220 GPRS/SMS monitoring device. It provides an overview of the device, describing its size, accessories, main functions, and specifications. The main functions include supporting wireless sensors, transparent data transmission, main and backup data centers, an embedded lithium battery and temperature sensor, user-defined alarm SMS, I/O status buffering, ring and SMS alarms, SMS receipt confirmation, alarm clearing messages, and regularly reporting I/O status.