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A Canadus High Frequency Battery Energizer may not look overly impressive, being just a small box with a light and two wires, but it's just one more case where looks aren't everything. While the purpose of the Canadus HFBE units is purely functional, ironically, the more auxiliary lights and stereo equipment your four-wheeler has, the more HFBE can do for you. On top is the HD-1200, made for trucks and other multibattery applications; below is the SD-1200 for four-wheelers with only one or two batteries.