... 40KHzSENSOR; 4. SPL:min.110dB 12mm 40khz receive Ultrasonic Sensor1. Diameter:12mmSENSOR;2. Height:9.5mm;3 ... ceramic element, SMD magnetic transducers, condenser microphones, ultrasonic sensor,Atomization piece, speakers and other audio components. And ... watches, toys, alarm systems, reversing radar, ultrasonic cleaning, ultrasonic atomization, marine fish exploration, the range of ultrasound ...