Optimized for Ring Devices: Engineered specifically for Ring Video Doorbell Wired, Wired Doorbell Plus, and Wired Doorbell Pro models, this transformer ensures your devices operate without interruption, providing a reliable power source for optimal functionality. High Performance & Stability: Delivering a steady output of 24V AC at 40VA from a 120V AC 60 Hz input, this transformer is perfect for both residential and commercial settings. It supports multiple smart thermostats and doorbells simultaneously, making it an ideal choice for system upgrades or replacements. Universal Device Compatibility: Beyond for Ring products, this versatile transformer supports other leading like for Nest, for , for , and for Sensi. It's designed to provide a constant 24-volt power supply to a wide range of smart doorbells and thermostats, ensuring broad application.