Empatica EmbracePlus Instructions For Use Manual page 111

If any redness appears under or around EmbracePlus, stop using it and
let your administrator know.
Cable Charger
Take care when handling the cable charger.
Before charging EmbracePlus, inspect the cable charger. If you notice
any damage the cable should not be used. Contact your administrator
for replacement.
When charging EmbracePlus, connect the cable charger only to an IEC
60950 certified 5V USB power supply
Before charging, please check the charging contacts on EmbracePlus
and the cable charger and, if dirty, clean with a dry cloth.
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