An anti-roosting device is disclosed. It is then cooled in a thermoelectric cooler, and transferred to a font in pipe which is surrounded in a water jacket of cooling water from the tank. The voltage controlled oscillator oscillates according to both of the oscillating characteristic value and a frequency control signal. 01 and 30% by weight of the dry bulk material. As compared with the prior art, the present invention has such advantages as simpler structure, accurate positioning and convenience for installing and replacing. The method may include selecting the PCM from the matched entry based on the matching.