Make sure this fitsby entering your model number. POWER UP MULTIPLE THERMOSTATS AND DOORBELLS: Replaces and upgrades underpowered transformer with this 24V AC transformer, offering plenty of power for single or multiple thermostats and doorbells at the same UNIVERSAL COMPATIBILITY: This 24V transformer fits for Nest, Ecobee, Honeywell and Sensi smart thermostats; Also compatible with Ring Video Doorbell, Ring Video Doorbell 2, Ring Video Doorbell Pro, Nest Skybell Doorbell, and other devices that require constant 24 volt power for operation SPECIFICATION: Input is 120V/ AC, 60HZ; Output: 24V/ 40VA UL CERTIFIED AND SAFE USE: This 24V volt transformer is UL-certified, offers reliable performance EASY TO INSTALL: Screw down or threaded clamp to electrical box, simple to wire up; Please Note: the brand names above is only for demonstrating compatibility