JBJ Nano Cube 12 Gallon Regular Replacement 24W Compact Fluorescent Ballast 
 
Fits - Nano Cube Nano Cube OG & DF
This is the original ballast for the Nano Cube 12 gallon regular.
This is the small Ballast for the unit with 1 bulb
Does not work with the 12 bulb units
Original Style (older style - power compact lights)
 
*Note* - This part is for the Old Power Compact Nano Models and WILL NOT work with the Newer all-LED model aquariums. Does not include power cord, switch, bulb or mounting kit.