Provided is a photodetector that detects missile launches from an above-flying surveillance platform through clouds. The method includes the main processor executing a program on a program thread, encountering a first section of code to be executed by the active memory device, changing, by a first command, a power state of a powered unit on the active memory device based on the main processor encountering the first section of code, the first command including a store command. The first layer of material may be either an acoustic fiber batting andor an acoustic foam material and may be an elastic or inelastic material. While the coil is applied first direction currents, the rotor shaft rotates and to make the contact unit from the open state to the closed state or the contact unit keeps the closed state. The invention further relates to the porous materials thus obtainable, and also to the use of the porous materials for thermal insulation. Hence, power can be diverted if necessary or desirable from the press to activator to reduce the overall power consumption of the binding device.