Factory-Direct cULus Certified Transformers
​Manufacturer Quality | Certified Safety
​As a professional manufacturer, we provide high-quality door chime transformers (C905, C907, C909) directly from our factory. Every unit is cULus Certified (File No. E99697), ensuring the highest safety standards and full compliance with North American building codes.
​Model C905 (16V/10VA): Reliable standard for single-chime homes.
​Model C907 (16V/30VA): High-power output for multiple chimes.
​Model C909 (8V/16V/24V, 20VA): Tri-Volt flexibility for smart-home systems.
​Why Choose Us?
​Safety Guaranteed: cULus listed (E99697) with built-in thermal protection.
​Direct-from-Factory: Precision engineering and rigorous quality control.
​Easy Install: Quick-lock design for professional and DIY setups