Features:
1) Function: transmitter and receiver
2) Terminal: pin
3) Housing material: aluminum;
4) Sound pressure level: >/=100dB
5) Sensitivity: >/=-74dB / V / ?ar
6) Center frequency: 40 +/-1.0kHz
7) -6dB directivity (deg): 80+/-15
8) Static capacitance (pf): 1,600+/-20%
9) Allowable input voltage: 140V
10) Operating temperature: - 40 ~ 80?
11) Storage temperature: - 40 ~ 85?;
12) Applications: range finders, burglar alarms, automatic doors,
remote controls, ultrasonic distance meters