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Need datasheet for an Ultrasonic Transducer

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I need the datasheet on an ultrasonic transducer I pulled out of a house alarm system.

There isn't a 'name' on the part. It is the transmitter. Made in Japan two rows of numbers: 14621 and then 80,13. I also have the receiver which the only difference is the number 14618.

This used to be part of an old Central Alarm system that was installed in my house before I bought it.
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