Update, lots of questions I probably should have answered up front. It does have light and sound electronics fully integrated, but it isn't one of the "crystal reveal" style sabers. It was produced in 2006 as part of a special custom order.
The button on top is a plunger style, it just gets stray contact occasionally, and could easily be fixed with either a new button or a resolder. I might even knock that out myself this week.
New photos added to the original post - let me know if I can help answer anything else!