Amazon.com : YXQ SFM-27 DC3-24V Electronic Buzzer Alarm Active Piezo Sounder Continuous Sound Beep with Cable : Electronics
Amazon.com: TEHAUX Motherboard Speaker Buzzer Piezo Speaker- 6PCS - 20- B Mini Active Piezoelectric Buzzer DC 3-24V 85DB Small Enclosed Piezo Electronic Buzzer Alarm with Wires, Black Piezo Beeper : Electronics