This is Original Astro Replacement AC Power adapter. It can only be use for astro beyond DMT4 and  NJOI DMT4 model decoder. (NOT COMPATIBLE TO ZAPPER DECODER TYPE) pls refer picture for decoder type

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MODEL:EADP-30LB
INPUT: 100 - 240v -0.7A,50/60Hz
OUTPUT: 12.0V  2.5A