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Zahn Electronics Inc. (ZEI) products meet the strictest standards for reliability and durability in the industry. All ZEI products are designed with robust electronic filtering and conditioning at the input, therefore, no external filtering is necessary. All of our products are designed, manufactured and tested in Wisconsin, USA. Every component, sub-assembly and finished product we sell is tested and quality certified before it leaves our production facility. http://www.youtube.com/watch?v=JcQ5Rvaa5R4