The Tobii Dynavox I-Series (I12, I15, I12+ and I15+) is IP43 classed. That means it is protected against objects >1mm and spraying water (Water falling as a spray at any angle up to 60° from the vertical shall have no harmful effect.) If you intend to be out in the rain, you should consider to cover it but it can withstand a bit of spray water.
It survived a few splashes at the Ice Bucket Challenge :).
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