Features: 1) Function: transmitter and receiver 2) Terminal: pin 3) Housing material: aluminum 4) Sound pressure level: >/=115dB 5) Sensitivity: >/=-64dB 6) Center frequency: 40+/-1.0kHz 7) Directivity (deg): 50 8) Static capacitance (pf): 2,400+/-20% 9) Operating temperature: - 30 ~80°C 10) Storage temperature: - 40 ~ 85°C; 11) Applications: range finders, burglar alarms, automatic doors, remote controls, ultrasonic distance meters