Check the listing for details. Maxdot Doorbell Transformer 16V 30VA Compatible with Ring Wired Video Doorbell. Color: Silver, Condition: Open box. Listed at 18.19 USD. BrandMaxdotPower SourceCorded ElectricProduct Dimensions2.6"D x 2.4"W x 3.9"HCurrent Rating1.5 AmpsMaximum Frequency60 HzAbout this item【16V 30VA Doorbell Transformer】Input: 120V, 60 HZ; Output: 16V at 30 VA; Low voltage hardwired doorbell power supply for residential, commercial and industrial use, offers reliable performance, safe to use【UL Certification】This doorbell transformer has UL Certification, which greatly improves safety and longevity, as transformer without this certification have a higher risk of circuit induced fire house problems during operation【Compatibility】The transformer doorbell power supply compatible with Ring doorbell transformer, Nest, Ecobee, Sensi and Honeywell thermostat and doorbells【Easy to Install】The 16V doorbell transformer is easy to replace and install, and can be screwed, threaded, or threaded clamped to the electrical box, and we provide clear wiring diagrams for proper wiring