... .20mA; 3. SPL:min.70dB; 4. Frequency:400Hz; KS-23S003AW Mechanical buzzer1. Rated voltage:3.0VDC;2. Rated current:max.20mA ... producing electro-acoustic components such as buzzer(Piezo electric, electromagnetic, mechanical), piezoelectric ceramic element, SMD magnetic transducers, condenser microphones, ultrasonic sensor ... Standing First”. We will try our best to satisfy 400HZ Mechanical buzzer