The family of electronic detectors TE 33 .. is able to receive the emission of infrared beams emanating from a body at a distance until 6m. The presence of a warm body moving in the area controlled by the sensor take the power stage of the device and makes the device compatible with any alarm system. The intersection of zones of sensitivity to multiple sensors, including different versions, does not cause interference, so is possible to use multiple elements in the same area. From the moment of operation the device takes about 30 seconds to reset itself and then it is ready for another operation.