Features: 1) Function: transmitter and receiver 2) Sound pressure level: ≥95dB (30cm / 10Vrms sine wave), 0dB=0.0002µbar 3) Sensitivity: ≥-74dB / V / μbar 4) Center frequency: 40±1.0kHz 5) Echo sensitivity: ≥150mV 6) Decay time: ≤1.3ms 7) Directivity (deg): a) x-axis: 110±15 b) y-axis: 65±10 8) Capacitance (pf): 2,000±15% 9) Allowable max. input voltage (Vp-p): 140 (40kHz) 10) Pulse width: 0.5ms 11) Interval: 20ms 12) Mean time to failure: 50,000h 13) Operating temperature: - 40 ~ 80°C 14) Storage temperature: - 40 ~ 85°C 15) Applications: range finders, burglar alarms, automatic doors, remote controls, ultrasonic distance meters