... ROHS REACH 9*4mm the side emission magnetic buzzerMagnetic transducer without driving circuitDiameter:9mm;Type: ... electric, electromagnetic, mechanical), piezoelectric ceramic element, SMD magnetic transducers, condenser microphones, ultrasonic sensor,Atomization piece, ... are widely used in household appliances equipment, watches, toys, alarm systems, reversing radar, ultrasonic cleaning, ultrasonic ...