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 8 digital inputs, 4 relay outputs 4 analog inputs, 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