Features:

• Ultrasonic Ceramic Transducers (40 KHz) - Sender + Receiver
• Open type
• Indoor use only 
• Separate sensors for transmit & receive. 
• Dimension: 16mm (diameter). 
• Terminal pitch : 10.16 mm (0.4")
• Nominal Frequency (KHz): 40KHz
• Emission sound pressure at10V (0dB = 0.02mPa): ≥ 117dB
• Receiver sensitivity at40KHz (0dB = V / ubar): ≥-65dB
• Capacitance at1KHz, <1V (PF): 2000 ± 30%
• Weight 2.2g

Application:
Motion detector, range finder, remote control, proximity switch , robotics