If you don't want to dump silicone all over the electrical components (in case you need to get to dip switches or programing buttons) pick up what is called a heat shrink end cap. Stick the electrical guts in the end cap with the wires sticking out and shrink it down. Then you only have to seal where the wires are coming out. You could also use regular heat shrink tubing, which should be easier to find, and just seal up both ends.
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