Ultrasonic Transceiver, Open Type, 40KHz Frequency, 12mm Dia,
Alum...

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

Wide - Something with a large width.

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