This listing is for a NuTone Model 105-T low voltage transformer, ideal for doorbell chimes, thermostats, and other small electrical applications. It features a 120V AC primary input and provides a 16V AC secondary output with a 15 Watt power rating. The unit is new old stock (NOS) and comes in its original, though slightly worn, packaging. It is designed for easy mounting and reliable performance, perfect for replacement or new installations requiring a compact and efficient step-down transformer.