A processing apparatus that processes a wooden piece into a predetermined shape by compression, includes a pair of metal molds that serve to hold and to apply compressing force onto a wooden piece cut out from uncompressed raw wood. A plurality of protrusions is connected to the hub and radially extending from the hub. When the car is stolen, the owner can activate the signal code, which will disable the engine once the thief turns off the engine. It transits the level of the detection signal and produces a control signal for starting up or cutting off the variable power supply. The display chassis may have four edges that surround a rectangular opening.