Acme True-Power® products consist of specially designed ferroresonant transformers that provide reliable, regulated output voltage with varying input voltages. True-Power power line conditioners accommodate a range of +10/-20% around nominal input voltages of 120/208/240 and 480 volts. True-Power® power line conditioners also have noise attenuation capability of 120 db for common mode and 60 db for transverse mode. All power line conditioners are UL Certified. Hardwired units are epoxy encapsulated to reduce sound levels below ANSI Standard C 89.2 and are also CE certified.