The best way to record sound on any of our dopplers is to use the included 3.5mm AUX cable and plug it into a phone if you have the headphone port available still.
Alternatively, you could plug it into the microphone port on your laptop or desktop computer and use an audio recording program to capture the sounds .
The best app to record it is Voice Memo if you are using an IOS device or a Sound Recorder when you are having an Android phone.