transducer 8D25-1000 diameter:20mm frequency:1.65MHZ transducer8D25-1000diameter:20mmfrequency: ... professional enterprise to research,produce and sell various piezoelectric elements,piezoelectric sounders,piezoelectric ultrasonic tranducers and piezoelectric horns,electro-magnetic buzzers.The monthly output is ... :-Material:ABS,PPO,PPT-Connection terminal:Pin,wire,SMD piezo ultrasonic transducer