These are heavy duty Professional ultraviolet blacklight units. Made by Jim Weber Lighting Company, the main pro film production lighting house in St. Louis for many years. Vintage '80's with pro build quality, black crinkle finish, made to last.
Each unit has a short cord w/standard house plug, plus another plug receptacle at the opposite end, so multiple units can daiseychain together and all be powered by just one extension cord to the wall.
All work well. Each includes a new or near-new vintage 4 foot long UV blacklight fluorescent bulb, with zero or very low hours of use. All are the vintage US-made GE or Philips that give far more/stronger UV blacklight than LED etc type and newer lights (which pollute their weak filtered UV with a lot of visible light spectrum, so don't make fluorescent colors pop anywhere near like these bulbs). Some units have built-in reflectors.
I have 4 of these lights left, priced to sell at $95 each.
Will delete or edit ad as they sell. Just tell me when you want to meet.