Nonin Sensmart H500 Operator's Manual page 38

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WARNING: Protect from exposure to water or any other liquid, with or
without AC power.
CAUTION: Do not place the device in liquid or clean it with agents
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containing ammonium chloride, isopropyl alcohol, or products that are
not listed in this operator's manual.
CAUTION: Use a detergent that is safe for skin and washable surfaces.
!
Most detergents can be high sudsing, so use sparingly. Wipe with a
damp, detergent-free cloth to remove residue.
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Care and Maintenance