Clicky here and all your questions will be answered for ordering. I don't like the bezel personally and did it like the top directions here. Without the bezel it blends in extra well with the plastic.
Not lighted at night? That's when you most need to know voltage levels as you're auxilary lights are blazing away and electric vest is dipping into that battery reserve.
And are they water and weatherproof like the Datel? They call them "splashproof". I suppose that's better than those pieces of crap from RadShack, but will they work after a couple rides in the rain?
The Datel isn't cheap, but it's epoxied and extremely rugged. I could only imagine it possibly failing on those with the FJR 1300U model....where U stands for U-Boat