This is a Code3 warning light bar strobe that measures about 29 inches wide. It comes with the wiring harness and switch panel as shown. It has multiple flash patterns, just three of which are demonstrated in the video:
The latest model of this light bar is over $700 on Amazon: https://www.amazon.com/dp/B01L9JEJB6/?tag=elightbars-20 Priced at $300 shipped in the USA. Just the trunk lid itself for $100 picked up from zip code 20854 and it will have holes from the removed light and 2 antennas (snap in rubber plugs).