IP44
A product that has a rating of IP44 means that it is protected against solid objects that are bigger than 1mm and water splashing from all directions.
IP54
A product with an IP54 rating is protected against dust ingress sufficient to prevent the product from operating normally but it's not dust tight. The product is fully protected against solid objects and splashing of water from any angle.
IP55
An IP55 rated product is protected against dust ingress that could be harmful for the normal operation of the product but is not fully dust tight. It is protected against solid objects and water jets projected by a nozzle (6.3mm) from any directions.
IP65
If you see IP65 written on a product, this means it is fully dust tight and protected against solid objects. Plus it is protected against water jets projected by a nozzle (6.3mm) from any angle.
IP66
A rating of IP66 means that the product is fully protected against dust and solid objects. Moreover, the product is protected against powerful water jets projected by a nozzle (12.5mm) from any directions.
IPX4
An IPX4 rated product is protected from water splashes from any angle.
IPX5
A product with a rating of IPX5 is protected from water jets projected by a nozzle (6.3mm) from any directions.
IPX7
A rating of IPX7 means that the product can be immersed in water for a maximum of 30 minutes at a depth between 15cm to 1m.