Microdot Connector, 4 Hz to 70 kHz, 44 dB(A) to 166 dB, 1.45 mV/Pa, 1/4" Pressure Response Acoustic Sensor—The GRAS 46BD provides functionality for measuring high sound pressure levels at high frequencies. It has a wide frequency range reaching up to 70 kHz and a large dynamic range from less than 44 dB(A) to 166 dB. The GRAS 46BD includes a 1/4" constant current power (CCP) preamplifier and features a built-in transducer electronic data sheet (TEDS) chip. You can use the TEDS chip to program the GRAS 46BD as a complete unit.