KS-23S003AW Mechanical buzzer 1. Rated voltage:3.0VDC; 2. Rated current:max.20mA; ... in producing electro-acoustic components such as buzzer(Piezo electric, electromagnetic, mechanical), piezoelectric ceramic element, SMD magnetic transducers, condenser microphones, ultrasonic sensor ... First”. We will try our best to satisfy 400HZ Mechanical buzzer