TRANSDUCER PIEZO 1.75KHZ 72DBA 16VDC; Transducer Function:Alarm; Tones:Slow Pulse Warble; Supply Voltage Min:6V; Supply Voltage Max:16V; Operating Current Max:27mA; Sound Level SPL:81dBA; Resonant Frequency:2.9kHz; Colour:Black ;RoHS Compliant: No