12mm 40khz receive Ultrasonic Sensor 1. Diameter:12mmSENSOR; 2. Height:9.5mm; 3. Frequency:40KHzSENSOR; ... , mechanical), piezoelectric ceramic element, SMD magnetic transducers, condenser microphones, ultrasonic sensor,Atomization piece, speakers and other audio components. And our company ... us for business inquiry at any time! 12mm 40khz Ultrasonic Sensor