... ; 4. SPL:min.110dB 12mm 40khz receive Ultrasonic Sensor1. Diameter:12mmSENSOR;2. Height:9.5mm;3 ... buzzer(Piezo electric, electromagnetic, mechanical), piezoelectric ceramic element, SMD magnetic transducers, condenser microphones, ultrasonic sensor,Atomization ... watches, toys, alarm systems, reversing radar, ultrasonic cleaning, ultrasonic atomization, marine fish exploration, the range of ...