The iSOS-800-PT is a handheld wireless emergency call button product, via the Sub-1 GHz RF communication interface, it can approach real wireless deployment. It provides emergency call for help function and improves personal safety protection. This system is very suitable for public area construction; for example: public toilets, hospitals, nursing homes, open campuses, large parking lots, etc. The iSOS-800-PT features built-in lithium battery to deliver reliable electricity and reduce the cost of wiring. It can realize emergency information transmission, meet low energy consumption, wireless communication, and emergency monitoring, etc., greatly reduce the time and human resources required for system construction and maintenance.