Broan-NuTone C905 16v, 10va Transformer Not all transformers are equal. In fact, our transformers feature easy-to-install lock-mount or wall-mount that can reduce installation time by 25%. A second unique feature that provides added reassurance is t he thermal cut-off switch designed to shut off the door chime system in the event of excessive temperature. Broan-NuTone C905 16v, 10va Transformer Features: • Quick Install Transformers, Built to Last • 16-Volt, 10VA Transformers for use with most NuTone door chimes • 16-Volt 10VA for a single chime • Sold in packs of 6 • C905 Transforme