... for the field of pro-amplifier, audio system, home electrical appliance, lighting, Me Specifications toroidal output power distribution telecom ... Low No-load Losses5. Low Mechanical Hum6. Low Stray Magnetic Field 7. Low Operating Temperature8. High Efficiency9. Good Static Insulation ... Use refined material, such as core, wire, and copper, magnetic. Connecter ect. All raw materials have passed UL, CE, ...