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85dBA Piezo Transducer (Speaker) Specifications Rated Voltage: 3Vp-p (square wave) Operating Voltage: 3-30 Vp-p Max. Current: 5 mA (max.) Resonant Frequency: 4000 Hz A 500 Sound Output: 85 dBA at 10cm (@ 3Vp-p 4.0KHz) Dimensions: 5.5mm high x 30mm diameter