Interference Elimination Switch Tuning Automatic Audio Frequency2 kHz Warble Operating Temperatures-35o F (-37o C) to 158o F (70o C)Width3.25′′ (8.3 cm)Thickness1.25′′ (3.2 cm)Length19′′ (48.3 cm)Total Weight18.6 oz (527 g)U.S. Pat.D459246SBattery Requirements one 9V (included).