MC165 provides nearly flat output voltage response over a very wide frequency range of magnetic field: 2 - 300 kHz, then declines gradually and smoothly 300 kHz to 1 MHz. 

The MC165 is similar to the MC161 and MC162 except the freq response of MC165 is much smoother 500 kHz to 1 MHz.   

NIST traceable calibration data table is delivered with each sensor from 0.5 kHz to 999 kHz. 

Output voltage is 1 mV per milliGauss field over the flat response frequency range. 

Output voltage from sensor is same frequency as the magnetic field frequency.

The sensors are not calibrated above 1 MHz and may produce an output RF voltage when receiving some magnetic field frequencies above 1 MHz.