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The WM transmitter has 5 vent holes arranged in a small circle on the back panel. We had a customer cover the vent holes on about 20 units with a metal plate (label). Seventeen of these units then ruined the membrane switch surface due to internal pressure build up as the units were moved from cool surroundings to much warmer areas. In operation, the units are very airtight except for the vent. It has a Goretex seal that blocks water but passes air. We will mark all future units with engraving on the back plate that says "Don't block this vent". We put five holes back there because the milling equipment doesn't care and we figured it would be impossible for dirt or gunk to block all the holes. In sum, don't put labels over the vent holes. Best Regards, Larry Fisher Lectrosonics
