1,widely used in parking radar system 2,high sensitivity 3,ringing time's less than 0.8ms 4,high reliability Shenzhen Lyrender Electronics &Technology Co,.Ltd Part NumberWS1640F2-WCenter frequency kHz 40.0±1.0Output sound pressure dB@30cm/10V sine wave ≥105Receive sensitivity dB / v / μbar ≥-82-6dB Directivity deg. 75 ±10Ringing Time ms ≤0.8Capacitance pf @ 120Hz 25°C 2000±10%Input voltage Vp-p ...