One of our star products is the sending alarm modem. The device sends an alarm to an specificate number, by SMS. The modem has a SIM card (like mobile phones). Thanks to M2M technology that allows monitoring and posterior alarm sending. We have different versions according to the needs for 8 alarms, 16 alarms... For more information click the links below: Alarm sending Modem by SMS Sistemas & Control Integral Siglo XXI C/ Jaume Balmes,10 08210 Barbera del Vallés Datasheet of 0804 Modem. Manual of 0804 Modem. Datasheet of 1616 Modem. What is M2M? Sitio WEB en construcción y pruebas. Registered in the commercial register of Girona tome: 2659 Folio 112 Sheet Number GI-46292 Inscription: 1st