4U CHECK4U KWS Manual - Page 15

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*Sometimes, even if it is an original product, the red led might be on.

In this case, wipe the ID card surface and insert it again. If the card is

damaged, there can be an error.

Do not disassemble the equipment but use the cleaning card when cleaning the

inside.

SENSOR

* Wrap both sides of the card with a thin cloth (to let it fit into the home) and

dip it with an alcohol to clean.

As a reference,

Cleaning Methods

Swipe the cleaning

card up and down