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Description: 
1. The nominal frequency (KHz): 40 KHz 
2. emission sound pressure at10V (0dB = 0.02mPa): ?117dB 
3. Receive sensitivity at40KHz (0dB = V / ubar): ?-65dB 
4. capacitance at1KHz, <1V (PF): 2000 ± 30%