DC24V Doorbell transformer compatible with smart thermostats and doorbells, such as Nest, Ecobee, Honeywell, Sensi thermostats, and Video Doorbell, Video Doorbell 2, Video Doorbell Pro and Nest Skybell doorbells Upgraded DC 24V1A Thermostat Transformer - With the upgraded system, the new adapter is more stable and without noise during use. Continuously transfer 110-240v to DC 24volt Make your thermostat works more stable and safe.  C Wire and Doorbell transformer adapter is 33 feet, long enough to plug it into an electrical outlet inside or outside your house, and charge your smart thermostats and doorbells continuously, solve all battery issues and with no more interrupt or any safety concerns  For Ring doorbell plug practicality：Easy and quick solution to the "low battery" problem, which means your video doorbell or thermostat can work for you at any time, without having to remove the battery to recharge, which is what we want it to do for you Service: We are committed to providing excellent customer service and your peace of mind is our top priority. We always offer you a two year warranty. If you have any questions about this product, please feel free to contact us via Amazon email or questions and answers, we will solve your problem within 24 hours, your satisfaction is our company's purpose

solsinsy