Features: 1) Function: transmitter and receiver 2) Terminal: pin 3) Housing material: aluminum 4) Sound pressure level: ≥105dB 5) Sensitivity: ≥-74dB 6) Center frequency: 40+/-1.0kHz 7) Directivity (deg): 80+/-15 8) Static capacitance (pf): 1,800+/-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