Part Number 40C16T-1 40C16R-1 Construction Open structure type Open structure type Using Method Transmitter Receiver Center frequency 40.0 1.0KHz 40.0 1.0KHz Sound pressure level at 40KHz 114dB min.(0dB=0.02mpa) Sensitivity at 40KHz Capacitance 2500Pf 20% 68dB min.(0dB=10V/pa0 2500Pf 20% Maximum input voltage 20Vrms 20Vrms Directivity 60 15(-6dB) 60 15(-6dB) Operating Temperature -20°C-+70°C -20°C-+70°C Storage Temperature -40°C-+85°C -40°C-+85°C