![](http://51lm.cn/UploadFile/art_spic/PXF_12250.jpg) | 简介:GSM I/O and Alarms Modem The GSM I/O and Alarms Modem is a powerful, flexible and economic instrument which is used to control Digital and Analog I/O by SMS or Phone Call. It can be used for authorized door access, switching remote equipments, controlling gates or for monitoring a device status with possible alerts. ... |