Ultrasonic Transmitter, Open Type, 32.8KHz Frequency, 16mm Dia,
Al...

Aluminium - Corrosion resistant lightweight metal

Frequency - A term used to describe how often something is done

Frequency - A wave frequency is the number of times a wave repeats within a given time

Ceramic - A hard material with excellent heat resistance made by heating a crystaline substance such as clay

disc - A round flat object often used in reference to a computer storage media

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