The backlight is integrated into the movement. SWP has a red, green and blue LED, depending on whatever suits your preference.

It's also compatible with the A158WA-1, which is basically an F91W, but with a steel case (the steel bracelet can be replaced with an 18mm leather strap if you prefer).

I haven't put the SWP in yet, so I can't comment on how good it is, but it looks very promising.

BTW, if you want the high accuracy feature, you have to change some settings and flash a new firmware with nanosec enabled.