... 5VOpenrating Voltage1-3VMax.Rated Current80mACoil Resistance5.5ΩResonant Frequency2731KHZMin.Sound Pressure Level75DB/10CMOperating temperature- ... electric, electromagnetic, mechanical), piezoelectric ceramic element, SMD magnetic transducers, condenser microphones, ultrasonic sensor,Atomization piece, ... 200 different specifications of the electro-acoustic devices products at present, but also continue ...