A system and apparatus for sensing temperature to prevent electrical fires is provided for. Here, a device that plugs into a wall outlet, or attaches to the wall plate of a wall outlet, is equipped with an audible alarm and at least one temperature sensor, such that the device can sense the temperature of an appliance plugged into it, as well as the temperature of the electrical wires powering the wall outlet and the outlet receptacle. The device is capable of turning off the power to an appliance, as well as ejecting itself from the wall outlet entirely. It can be operated automatically or through a software application. Optionally, the apparatus is combined with a second device that connects to the main circuit panel of a house that is capable of stopping the flow of electricity to an entire house.