... Ultrasonic Sensor 1. Diameter:12mmSENSOR; 2. Height:9.5mm; 3. Frequency:40KHzSENSOR; 4. SPL:min.110dB 12mm 40khz receive Ultrasonic Sensor1 ... components such as buzzer(Piezo electric, electromagnetic, mechanical), piezoelectric ceramic element, SMD magnetic transducers, condenser microphones, ultrasonic sensor,Atomization piece, speakers ... for business inquiry at any time! 12mm 40khz Ultrasonic Sensor