Piezoelectric ceramic buzzer thin plate : 27mm (dia) Specification Resonance Frequency: 4.6 Khz +/- 0.5 Khz Resonance Impedance: 200 Ohms Capacitance: 20nF +/- 30% at 1 Khz Operating Temperature -20...+70 C Storage Temperature -30...+80 C *Image shown is a representation only.  ..