We only have 2 openings in the chassis, one for the ambient microphone and one for the speaker. The ambient microphone opening is protected by a water-proof membrane that withstands 1.0 Bar instant water pressure. The speaker itself is water resistant, but has no additional membrane. It would reduce the sound quality. The speaker is not made for being submerged for hours, but in our tests, no water entered the sealed ear canal down to 1 m depth. If water enters the double acoustic chamber, a few taps on the device will remove the water.