Intermatic PX300S Pool Light 300-Watt Safety Transformer, Stainless Steel, Brown Designed to supply 12 volts to pool/spa lights, submersible fixtures and outdoor garden lights Grounded shield between the primary and secondary windings Built-in circuit protection 3R Brown Stainless Steel enclosure with a total of 10 combination 1/2" inch - 3/4" inch knockouts: (2) right side, (2) left side, (2) back and (4) bottom 7  inches (19.4 cm) (H) x 5  inches (13.3 cm) (W) x 4  inches (11.4cm) (D)