AngelSounds JPD-100S Mini Manual Del Usuario página 7

Count the number of sounds per minute and get information about your
heart rhythm. We recommend that you repeat the counting more than
once.
Audio recording
You can also record these sounds while listening to heart sounds. Just
connect the recording cable (not included) to the miniUSB connector, plug
the other end into the device on which the sound will be recorded and
start recording.
Safety Warnings
Avoid using the device in an environment with a potential risk of
explosion, high or very low temperature or humidity, near an open flame.
We recommend that you do not use the device outdoors.
Always wipe off the gel from the device after monitoring.
Do not use the device if it shows signs of damage!
If you clean your device, always keep it turned off