Reception range of the reader by many factors, the wave frequency, the label size and shape, the energy of the reader, the interference of metal objects, and other RF devices. Overall, the low-frequency passive tags receiving distance in feet or less, for the high-frequency passive tags receiving distance of about three feet, for UHF tags receiving distance in ten to twenty feet. For semi-active and active battery tags, readers can receive three hundred feet or even further signals. For low and high frequency radio, if the label and the same size as the reader antenna, receiving antenna diameter distance can be calculated by multiplying 1.4. In less than thirty centimeters in diameter, this rule will apply.