Vista Professional Outdoor Lighting MT-300 Stainless Steel MT Transformer 300W. Our next generation of transformers includes many new features while maintaining the quality and reliability that Vista is known for. Some of the features include an extra-large terminal strip for multiple low voltage cable connections and a 120-volt terminal strip for easy hardwiring. A custom-designed, weathertight, clear-coated, stainless steel casing seals components from moisture and debris. Take-apart stainless steel hinges allow for easy door removal and greater access during installation. All Vista Transformers come with a lifetime warranty.