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This 24V 40VA doorbell and thermostat transformer is the ultimate solution for powering your home devices. With an input of 120V at 60 HZ and an output of 24V at 40 VA, it provides a stable and reliable power supply for both doorbells and thermostats, making it suitable for a wide range of applications, from residential homes to commercial and industrial settings.Safety is our top priority. This transformer is UL - listed, which means it has passed rigorous safety tests. Transformers without this certification often pose a higher risk of circuit - induced fires and other safety issues during operation. By choosing our UL - certified transformer, you can have peace of mind knowing that your home and devices are protected.When it comes to compatibility, this transformer shines. It works seamlessly with many well - known smart home devices. Whether you have a Ring doorbell (any version), Nest Hello Doorbell, or popular thermostats like Nest, Sensi, and Honeywell, this transformer is the perfect power supply.Installation is a breeze. You can easily replace your old or underpowered transformer. It can be attached to the electrical box using screws, threads, or thread clamps. To make the process even simpler, we provide clear wiring diagrams, so you can complete the installation with confidence. Thermostat and Doorbell Transformer：Input: 120V, 60 HZ; Output: 24V at 40 VA;This low - voltage hardwired transformer is suitable for residential, commercial, and industrial use, offering reliable power for doorbells and thermostats. Safe UL Listed：This doorbell transformer has passed the UL test.It significantly reduces the risk of circuit - induced fires and other house problems, ensuring long - term and safe operation. Wide Compatibility:The transformer doorbell power supply compatible with Honeywell thermostat and doorbells, compatible with Nest, Sensi, Ring doorbell transformer(all versions),Compatible with a variety of popular devices. Easy Installation:Effortlessly replace and install this 24V transformer. It can be screwed, threaded, or threaded clamped to the electrical box, and we provide clear wiring diagrams for proper setup. Exceptional Customer Support: We are committed to providing high - quality products and excellent customer service. If the transformer fails to meet your expectations, contact us, and we'll do our best to resolve the issue. You're eligible for a refund or exchange if the problem persists. UPC 716841565126 ASIN B0F4D84VY2 Model 99d19a0a-cc52-44e1-b24d-c7ac7de5d97f Brand Name YUNFOOK Part Number YF-BYQ05 Manufacturer YUNFOOK Power Source Corded Electric Mounting Type Surface Mount Maximum Frequency 60 Hz Minimum Frequency 60 Hz Specification Met UL Included Components Doorbell Transformer