Feature:* This mini electronic beeper support DC 3-24V power supply and produce continuous high-decibel alarm sound up to 90dB. * 27mm mounting hole spacing, 2-wire pigtails easy to connect.* Just connect to to any power supply from DC3-24 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. Specification:* Name: Active Buzzer* Rated Voltage: DC 3-24V* Max Rated Current: 15mA* Mini Sound Output: 90dB* Wire Length: 10cm* Hole Diameter: 2mm x 2.5mm* Hole Distance: 27mm* Response Frequency: 3700+/-500Hz* Operating Temperature: -20C to 60C* Material: ABS Package included:* 2 Pcs x Active Electronic Alarm Buzzer