From off-the-self to fully customized, ETA-USA will meet your switching power supply needs. All of our standard products will meet FCC Class B requirements when connected to a resistive load. Our expert staff has over 30 ......From off-the-self to fully customized, ETA-USA will meet your switching power supply needs. All of our standard products will meet FCC Class B requirements when connected to a resistive load. Our expert staff has over 30 years of industry experience and can support your custom power requirements from concept to production.