... ovens,computers,calculators,digital cameras,eletronic dictionaries,ultrasonic planimeters,medical devices,micro-displacement positioner,high voltage generator,facsimile machines,telephones,electronic toys ... past 23 years.2.Main Feature of buzzer:-Small size;-High sound pressure;-Not allowed for wave soldering.3.The main ... Material:ABS,PPO,PPT-Connection terminal:Pin,wire,SMD piezo ultrasonic transducer