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Merck WHISPER ON ARRIVAL User Manual page 4

Veterinary device

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The handle contains two recording buttons for convenience, as both
buttons perform the same functions. The handle houses the LED lights
that are powered by two standard AAA alkaline type batteries that
should last a few months in normal operation and storage conditions.
NOTE
The lithium batteries are shipped from the manufacturer
in a low charge state. BEFORE FIRST USE, ensure the
battery is fully charged.
4

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