You might have come across products with a marking on them or on their packaging, like IP44, IP54, IP55 or other similar ones.
O nwere ike ịbụ na ị hụla ngwaahịa nwere akara na ha ma ọ bụ na nkwakọ ngwaahịa ha, dị ka IP44, IP54, IP55 ma ọ bụ ndị ọzọ yiri ya.