Features: Nominal frequency (KHz): 40KHz Emission sound pressure at10V (0dB = 0.02mPa): ?110dB Receiver sensitivity at40KHz (0dB = V / ubar): ?-75dB Capacitance at1KHz, <1V (PF): 1800 ± 30% The part with T is the Transmitter; the part with R is Receiver. Packaging includes 10* Ultrasonic Transmitters Probes 10* Ultrasonic Receivers Probes