JBJ 12 Gallon / MT-40 Nano Cube Replacement Fan Ballast Part # MT-40-FB
 
Fits -
12 Gallon Nano Cube Deluxe Style (old style - power compact lights)
Length of wires are 4" long 
 
*Note* - This ballast is for the old Power Compact 12 Gallon model and WILL NOT work with the Newer LED model aquarium.