An apparatus and method for bandwidth control is provided to keep the bandwidth more stable. The system mainly includes a group key management unit and a record protocol unit. The data validation circuitry is preferably programmable to select which bits of a word read from the memory will actually be used in the data validation operation. When external forces are applied to the secondary battery, the safety of the secondary battery is improved, and the occurrence of a short circuit is effectively prevented. This, in turn is based on the amount the arms have turned and thereby allows the tension in the cables to compensate for the moments on the arms due to gravity, whatever angles they are at, independently of the angle of the other arm. When the actuator is activated, the handle will pull and release the cord, thereby generating motion in the fowl body on the mounting stake to provide the appearance of a feeding bird.