The 'X' means the device was not officially tested for solid particles (dust), only for water resistance.

It is safe for underwater use, such as swimming, diving, or snorkeling, provided the depth remains within the manufacturer’s specifications (usually >1 meter).

"IPX8" means the device is designed to handle more than just temporary splashes (like IPX4) or brief submersion (like IPX7).

While resistant to deep water, IPX8 does not imply it can withstand high-pressure water jets or steam cleaning.