uxcell 2 Pcs DC 3-24V Active Electronic Buzzer Piezo Alarm Sounder Continuous 90dB Beep Speaker

["This mini electronic beeper support DC 3-24V power supply and produce continuous high-decibel alarm sound up to 90dB.","40mm mounting hole spacing, 2-wire pigtails easy to connect.","Just connect to to any power supply from DC 3-24 Volts. Complete drive circuit incorporated for direct operation from DC power source.","Widely used in the modification, DIY electronics reminder projects or other area needs sound alarm.","Package included: 2 Pcs x Active Electronic Alarm Buzzer."]