12mm 40khz receive Ultrasonic Sensor 1. Diameter:12mmSENSOR; 2. Height:9.5mm; 3. Frequency: ... mechanical), piezoelectric ceramic element, SMD magnetic transducers, condenser microphones, ultrasonic sensor,Atomization piece, speakers and other audio components. And our company ... to customer’s special demands under the hot challenge of current market.Our products are widely used in household appliances ...