This is a UV Ozone generator. Works well. Including a link with details about it. Same company same model just newer in the link.
UltraPure Water - UPS350, 120V, Ultra Pure Spa Ozonator, 4-Pin Amp - 42-280-1000, 1006520
Ultrapure Oxidizer® Chemical Reduction System®For portable and inground spas. Ozone generators are individually packaged with a 1/4 x 1/4 check valve, 6ft of 1/4”id clear pvc tubing, a 1/4”B x 3/8”thd adapter, (2) 1/4B x 1/4thd adapters, and mounting hard