| 摘要 |
The present invention relates to water-exposure protection of electronic circuitry within a mobile radio communication device such as a mobile cellular telephone. A water-absorbent packing is disposed around buttons or keys which extend through openings in the housing. The packing is able to absorb several times its volume of water. The water-absorbent packing absorbs the water as it enters the housing, thus stopping the further ingress of water and protecting the electronic components in the housing. Once the water source has been removed, the water absorbed by the material will evaporate restoring the full absorption capacity of the material.
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