The Message Master 4000 is a GSM based remote monitoring controller, it is small, user friendly with built-in software and has cool SMS up to 40 mobile phone, with 16 digital inputs and 2 relay outputs, HTML interface, TCP/IP over UTP Ethernet. Our Quad-Band 850/900/1800/1900 MHZ GSM modem are suitable for many country. Tried and proven for its reliability and capability