Brand: Philmore LKG. MPN: B818. DC Piezo Sounder with Circuitry. AUDIO / Signals. Product Specifications: continuous tone, voltage: 3.0 to 20V DC, output minimum: 95dB, 105dB at 20 volts, sound frequency: 2.8 Khz ?0.5Khz, typical current draw: 6mA @ 6V DC, 10mA max., ABS case meets UL94HB, lead wire: UL listed material, mounting ears on centers of 50mm, case diameter: 42mmO.D.