A: This fixture is rated 120/277V Spec Sheet is located on homedepot.com https://images.thdstatic.com/catalog/pdfImages/dd/dd930846-df7b-4d9c-9206-7f1d9986d906.pdf
A: This light is rated for 100-277 voltage range.
A: This fixture does not have knockouts on the endcaps to allow for through wiring. Please take a look at this fixture HD SKU1006805989. It may be more suitable to your application. It has knockouts at each end as well as a channel cover to hide any wiring resulting from hardwiring from the ends.
A: There is just a pigtail in the light. You can wire from either end as long as you have enough wire to make it over to the pigtail. I had many of these lights and have wired from cutouts on either end and I have even drilled my own hole to bring a wire in at a specific spot.
A: This fixture does not include a motion detector so yes you can operate it without a motion detector.
A: This light is not motion detection
A: This fixture is designed as a surface mount fixture to be hardwired It is not a shoplight with chain hangers and plug in cord