ZUMER BMT-0903,
Miniature electromagnetic (magnetic) internal-driven buzzerRated Voltage: 5V DC (operates typically between 1.5V and 12V DC)Resonant/Output Frequency: 2.3 kHzSound Output Level: 85 dB (at 10 cm or rated voltage)Dimensions: Diameter of roughly 12 mm x 9.5 mm depthConstruction: Sealed construction suitable for standard cleaning and soldering processes,