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