An electric field emission device having a triode structure is fabricated by using an anodic oxidation process. The first light source generates a first chromaticity light while the second light source generates a second chromaticity light. The voltage regulator circuit comprises a voltage divider to divide the output voltage, a comparator to determine whether the divided voltage is less than a reference voltage, a driver connected between the input voltage and the output voltage, and operating operate responsive to the comparator, and a controller to control the voltage divider to gradually vary the output voltage. In this manner, the column select control is removed from the drive path, thus increasing drive strength. A fixed vehicle body height can be subtracted from the proposed antenna height to provide a proposed tire radius. The landing preferably comprises a magnet for releasably securing product.