Check the listing for details. Ragnaros Hardwired Transformer Kit for All Versions of Ring Doorbells. Condition: Open box. Listed at 10.99 USD. Ragnaros Hardwired Transformer Kit for All Versions of Ring Doorbells. About this item 16 V 30 VA DOORBELL TRANSFORMER: powering single or multiple door chimes in one home,compatible with Ring Video Doorbell Pro, Nest Hello Video Doorbell,etc.Please consult the Voltage requirements of your doorbell for specific recommendations. ELIMINATE ISSUES CAUSED BY LOW POWER: Best replacement for 16v, 10va transformer,for drive an under powered ring pro. low voltage power sources for residential, commercial, and industrial uses. O MORE CLUNK SOUND:if you notice a buzz or hum sound from your ring doorbell,it's likely due to the transformer needing more power.or if you want to keep your ring doorbell hardwired. is the only way to make it happen. Get This transformer and be done! EASY INSTALLATION: Easy replacement took no more than 15 min.Turn off power before wiring,screw down or threaded clamp to electrical box, safe handling.can be mounted horizontal or vertical with a chime mechanism.Quick install transformers, built to last so you should have fewer call backs.