Operating Frequencies 2.4 GHz ISM band (2400 to 2483.5 MHz) Frequency Response 20 Hz to 20 kHz Depending on microphone type Operating Range 30 m (100') typical Open range environment with no interfering signals Total Harmonic Distortion <0.05% typical Operating Temperature Range 0° C to +40° C (32° F to 104° F) Battery performance may be reduced at very low temperatures