... and other applications. RTU5011 I/O interface>>>>>GSM Controller RTU5010/RTU5011 suitable for: 1. Security Alarm System application; 2. ... voice monitoring>>Internal Ttemperature sensor (*optional)>>Being available for internal battery and providing power cut off alarm (optional ... is a professional GSM Wireless Alarm, GSM Home Alarm System, GSM SMS Alarm, GSM SMS Controller, GSM Home Automation system ...