SMT Transducer SPT-1448 SMT Transducer FREQUENCY RESPONSE [actual curve of type] DIMENSIONS 46 Bottom View applied voltage: 10V. 1/2 duty, square wave distance for measurement: 10cm Model No Rated Voltage Operating Voltage Max. Rated Current Min. Sound Pressure Level Capacitance at 100Hz Resonant Frequency Operating Temperature Weight SPT-1448 12Vp-p Square Wave 30Vp-p Square Wave 2mA at 4KHz /12Vp-p Square Wave 85dB at 4KHz /12Vp-p Square Wave 10000¡À30%pF 4.0KHz -20~+80¡æ 1g Value .