TRANSDUCER PIEZO 2.9KHZ 90DBA 28VDC; Transducer Function:Alarm; Tones:Continuous Fast Pulse; Supply Voltage Min:3V; Supply Voltage Max:28V; Operating Current Max:8mA; Sound Level SPL:90dB; Resonant Frequency:2.9kHz; Colour:Black;RoHS Compliant: Yes