Outstanding for what it was designed to do
This is a capacitor bank plain and simple. A capacitor acts as a battery. When there is a current break it will supply power for a limited time (depending on the amount of capacitance).
I have several of these in different locomotives. Luckily, all of them were placed in locomotives that have either the PNP Econami or Tsunami2 decoders in them (they have a built-in plug). I removed the current keeper from its package, plugged it in, done, and all the hesitation problems with the locomotives disappeared, that simple!!
If you want to put one of these in a locomotive that is not equipped with the necessary plug there is a small amount of additional work involved (instructions included), nothing difficult at all (as long as the decoder is a Tsunami!!). I say this because the instructions are specific to Tsunami decoders. I know for a fact that some decoder manufacturers give instructions on installing a current keeper on their boards (TCS comes immediately to mind but it may be their current keeper, sorry don't remember). If your board is not Tsunami RESEARCH FIRST!!
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