Four wires; red, blue, green and black. Charming vintage style shielded 'clam shell' upright mounting construction. Measures approx. 1&5/16" wide, 1&3/8" deep and 1 and 5/8" tall. Mounts to chassis with two machine screws, mounting centers approx. 1&3/4". Mounting tabs on the bottom edge of the transformer extends 5/16" on each side. Brand New. Genuine Fender 0037099049. UPC 885978546718.