ForeverOzone invented the "bare bones" ozone generators to fill a need in the marketplace for a low priced, built to last ozone generator that is easy to use, easy to maintain, and will last a lifetime. We accomplished this by building this ozone generator without all of the "bells and whistles" found in most ozone machines. Why? If any product lends itself to the "KISS" principle (Keep It Simple Stupid) ...it's an ozone generator.  You see over time, ozone rusts the thin metal parts of on-off switches, timers, and mother boards and causes them to fail.  The transformer and ozone plate might be fine, but your ozone machine won't work.  This OG-7000 is also very easy to clean and maintain.   It comes fully assembled and ready to go, (except the ozone plate that needs to be plugged in to a socket ....packed in foam for protection)  This unit also is made without a fan. Why? The fans used in ozone geneators only move 100 cubic feet a minute of air.  A $18 20" box fan moves over 3000 cubic feet of air per minute!  Even if we placed a fan on this unit, you'd still need to employ a box fan to perform a shock treatment because you can't make butter with a tooth pick, and you can't create shock treatment levels of ozone without moving a lot of air!  Use a typical ozone machine with a 100 cfm fan and the air near the roof or 20 feet away will never make it's way into the ozone machine to be converted into ozone.  Another great feature, the open design.  Ozone shock treatments are performed in unoccupied rooms, so there's no shock hazard.  Heat destroys ozone, so our open design prevents heat buildup, a plus. Yet another great feature, if one transformer goes, you still in business!  Just send the burned out transformer in for a free replacement. We've been selling these unit's for years now with a LIFETIME WARRANTY on the transformers. Base is shatterproof Acrylic, screws stainless steel. Free shipping, receive within a week. Thanks for looking and take care.