SMS Socket, SMS Switch, Remote Control Module, Remote Control, Phone Extension Remote Control Unit Set Switch Butler, 230 V AC 10 A, White Plastic Housing, SMS Switch for Remote Control, Possible control via Android and iOS smartphone app, SMS commands are generated with a button, in application with the master unit, up to five circuits can be controlled and monitored individually or together, the range between the master and slave unit is up to 30 meters, no additional SIM card is required for the slave unit, the set includes 2x SMSB-S1-V4 and 1x SMSB-M1-V4 - Module type: Switch - Interfaces: 230 V socket - Remote access type: SMS permissions. On the SMS-Buttler, it is possible to set up a master user and four family members. All have the permission to send switching commands and query the status. In addition, the master can make configuration adjustments. Notification of weak GSM signal. The socket sends an SMS if the GSM signal is too weak. The function must be activated first via the master unit. Control via password protected SMS. By default, only the master and the four family members have the permission to turn the device on and off. For other unregistered users, the password-protected switching function can be used.