The present invention is related with a modem device in conjunction with a Low Power Controller, which provides the capability of local control and remote management of electromechanical appliances in cases, where the locally available electric power is very low, and it is specially designed to be electrically powered and to communicate via a single PSTN telephone line The device has a wide application range to institutions, which own and use areas containing both passive and active equipment, and provides the capability of a single uniform solution for all such cases. It provides the ability to connect various digital and analog sensors, the transmission of various commands, the process automation, the data and information collection and the remote control (management).