Energy Wizard simply plugs into an empty plug socket and reduces power consumption in the whole ring main. It is sold generally as a household device, but is probably better suited to a work environment where the power correction factor is less likely to be 1.
In theory the Ecotek Energy Wizard causes electricity consumption will be reduced by up to 10%. Although this would only really be achieved in an environment where there is a lot of inductive load usage. In practice, in our warehouse, it seemed to reduce consumption by about 4%, not so impressive but still worth bothering with.
The Energy Wizard is basically a capacitor across the mains, the aim being toimprove the efficiency of various appliances and circuits.