The SoundTraxx CurrentKeeper™ is designed to add additional power capacity to any decoder installation.
It can be used to overcome dirty track, limited electrical pickup or dead frogs to ensure reliable operation of any locomotive in your fleet. It measures 40 x 6 x 11mm.
They work very well in getting the locomotive over turnouts where power and sound can be briefly interrupted. They are rather large and won't fit in many locomotives.
Great product, easy to install.. Squeaky Trains great to deal with.