https://www.lutou-tech.com/products/75w-built-in-timer-low-voltage-transformer/ LT3075 is a 75W toroidal Transformer made of Heavy duty stainless steel and Toroidal copper coil, the outer casing protects the transformer against all severe weather conditions. Durable shield with locking latch, tightly locked to prevent water from entering, withstands years of use. 120V AC input and 12/15V AC output, built-in timer design, and photocell port available to enable sensing and timing functions.