The Song Meter SM4 has not been tested to record below 20Hz, but anecdotally we have heard customers doing so to record elephants, rhinos, etc. We do not recommend the Song Meter Mini nor the Micro for infrasonic projects. These models employ fixed high-pass filters and will not record useable signals below 20 Hz. With the SM4, the HPF can be turned off.

• What is the lowest frequency the Song Meter Mini Bat's ultrasonic microphone can record?
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• What type of data port does my phone or tablet have?
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