Continuous power supply with DC-DC converter 12-24V. This device came as a result of need for the reliable power source for wireless Internet systems. It is mainly used for maintaining constant power source for base stations and access points and is mostly used by wireless Internet providers,in places where often lack of power source from city network is a common issue. Of course, the device is common for many other aplications. Authonomy of the device depends directly of battery that is used and overall power consumption of the connected devices. On-board protection from discharging the battery and overload.