Why is this important?

• The protection rating indicates how well a device is suited to demanding environments involving moisture or dirt.

Wikipedia:

• (IP = International Protection). The combination of digits indicates the extent to which the product is protected against contact, foreign objects, dust and water.
• IP54 denotes comprehensive protection against splashing water and dust resistance, depending on the diameter of an object.
• Since IP65, the product is dust-tight and protected against water jets from any angle.
• [Wikipedia / Further explanation: de.wikipedia.org/wiki/Protection rating]

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