... livingroom.fix others whinout SIM in bedroom,storage,kitchen,and number them with 1,2,3,4…N,once happen ... , once the burglar broke in window,smoke detector with SIM will send host ”the window with NO 7 has ... accessorie can send warning to the smoke detector with SIM when low voltage,then Transpond to host ,for example ... time.it is better to use SSG-SD01 without SIM.6,When power off,the host will get SMS ...