... SPL:min.70dB; 4. Frequency:400Hz; KS-23S003AW Mechanical buzzer1. Rated voltage:3.0VDC;2. Rated current:max ... -acoustic components such as buzzer(Piezo electric, electromagnetic, mechanical), piezoelectric ceramic element, SMD magnetic transducers, condenser microphones ... Our products are widely used in household appliances equipment, watches, toys, alarm systems, reversing radar, ultrasonic cleaning, ...