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40KHz Ultrasonic Transducer Transmitter and Receiver Pair. These transducers are very useful in making various sensors for detecting obstacles and measuring distances. Features Use for motion or distance sensing Frequency: 40kHz ±1.0kHz Aluminum case Capacitance: 2000pF ±20% Transmitter: bandwidth 5.0kHz/100dB, sound pressure level 112dB/40 ±1.0kHz Receiver: bandwidth 5.0kHz @ -75dB, min. sensitivity 67dB/40 ±1.0kHz (0dB vs. 1V µbar) R=3.9k. Lead length/spacing: 0.28" Case size: 0.30"H x 0.43" Dia.