Specifications:
1) Rated voltage: 12VDC / 24VDC
2) Operating voltage: 3 - 20VDC / 18 - 30VDC
3) Max. current consumption: 15 - 20mA
4) Min. sound output at 10cm: 100dB / 105dB
5) Resonant frequency: 2.9?0.5kHz / 3.1?0.5kHz
6) Tone nature: continuous
7) Working temperature: -20 ~ 60oC
8) Weight: 13.4g
9) According to clients' specifications

Features:
1) Low power consumption
2) No contacts (therefore no noise)
3) Highly reliable