SFM-27-W piezo electric piezoelectric buzzer black hitam Ukuran: Diameter 30mm Tebal 15mm Spesifikasi: Rated voltage = 12V DC Operation voltage = 6-24V DC Rated current = lt; 30mA Sound output = gt; 90 dB Resonant freq = 3000 +/- 500 Hz Operating temp = -20C s/d +60C Storage temp = -20C s/d +70C