As I was programming my Fleck 5600SXT, I needed to know for sure the size of the BLFC button. The only markings on the outside of the unit was a hand-written sticker that says 1.0. So I took the button out and noticed that it was partially torn in 2-3 places. I ordered a new one and received it yesterday. No paperwork in the package - only the button. The button has 50 10 F embossed on the face. So what size is it? Thanks.