Features: 1) Function: transmitter and receiver 2) Terminal: pin 3) Housing material: aluminum 4) Sound pressure level: >/=120dB±3dB 5) Sensitivity: >/=-60dB±3dB 6) Center frequency: 40+/-1.0kHz 7) Nominal impedance: 1,000 Ohm 8) Static capacitance (pf): 2,400+/-20% 9) Bandwidth: a) T40 - 160: 2.0kHz b) R40 - 160: 2.5kHz 10) Ringing: 1.2 (max.) 11) Total eam angle (typical): 80° 12) Operating temperature: - 20 ~ 70°C 13) Storage temperature: - 30 ~ 80°C; 14) Applications: range finders, burglar alarms, automatic doors, remote controls, ultrasonic distance meters