300W 12V DC Electronic Transformer - Replacement for Lightech LET 303 DC UL Approved, 300W 12V DC Dimmable Electronic Transformer Great Replacement for LET 303 DC from Lightech Input 120V - 60Hz, 2.5A / Output 12VDC Dimensions: L: 5 1/2" x W: 3 1/4" x H: 1 3/4" / Center Hole DIA: 7/16" Dimmable with Low Voltage Electronic Dimmers only