Train Control Systems / KA2 Keep-Alive Device (SCALE=ALL) Part # 745-1456
Scale: HO Scale N Scale
Newly-redesigned at half the size of a KA4, the KA2 will power HO or N scale locomotives with approximately one-third of the capacitance of KA3/KA4 devices (depending on the locomotive and motor).
This Keep-Alive® includes a blue and a black w/ white stripe wire with which to attach it to a decoder.
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This unit works well. It is small and easy to install.
I used these as my first attempt at keep alive capability. I wired these into ESU decoders. Note that it is best to program the 315/32/113 CVs on the decoder to enable the keep alive functionality before wiring this in (you can also wire in a switch to activate/deactivate KA-2. Small form factor really fits well in HO hood diesels. I get a few seconds of keep alive time, more than enough for basic issues in keeping the sound and lights going at all times.