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Product Description GSM Relay System Gate Opener Door Alarm Temperature Humidity Monitoring 3G GPRS SMS Remote BTC Access Control Free Call RTU S2721.The GSM 3G M2M RTU is a multi I/O port remote terminal unit, through the RS232/485 port can connect intelligent meters or PLC. It isspecial for BTS monitoring, remote data acquisition, telemetrically, BTS access control and other applications. It supports voice communication,SMS, GPRS, 3G communications.2.The GSM 3G M2M RTU can be used as remote access control; the authorized users can open the gate or turn on the machine with a freecharge call at specified time. Features:1. ARM® Cortex™-M4 32