Features: 1) Function: transmitter and receiver 2) Terminal: pin 3) Housing material: aluminum 4) Sound pressure level: >/=100dB 5) Sensitivity: >/=-74dB / V / µbar 6) Center frequency: 40+/-1.0kHz 7) Directivity (deg): a) x-axis: 120+/-15 b) y-axis: 60+/-10 8) Static capacitance (pf): 1,600+/-20% 9) Allowable input voltage: 140V 10) Operating temperature: - 40 ~ 80°C 11) Storage temperature: - 40 ~ 85°C; 12) Applications: range finders, burglar alarms, automatic doors, remote controls, ultrasonic distance meters