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Open the Battery Cover.
Use Alkaline Batteries only.
Hold the Control System Casing with two hands as shown. Slide the Battery Cover in the direction shown by the arrow, by using both thumbs placed on the Battery Cover sides as shown, or by using one thumb applied to the ribbed indentation in the center of the battery cover.
Insert 2 AAA alkaline batteries as shown below. NOTE THE POLARITY - Reversing the polarity can cause damage to the ds32a+ stethoscope.
Compress the large battery spring sufficiently to ensure that the batteries are well-seated in the battery compartment, and that all springs connect with the battery contacts.
Close the Battery Cover.
Place the Battery Cover into the slide grooves, and slide the Battery Cover, using thumb and forefinger as shown, until fully closed. If the cover does not close easily, take care to ensure that the Battery Cover is pushed all the way into the grooves, and slides easily. Do not exert excessive force.
If your ds32a+ Stethoscope does not operate after changing batteries, carefully recheck battery polarity, and ensure that fresh batteries are being used.