DOORBELL POWER - 24v universal US power cable powers popular smart doorbells, plugs into your standard 110 v/120 v outlet and converts to 24 volt 500 ma AC current 16.4 FT EXTENSION CABEL - compatible with smart doorbells ：Ring Video Doorbell, Ring Video Doorbell 2 & Ring Video Doorbell Pro,Nest Skybell ；smart thermostats ： Nest 1st/2nd, Ecobee, Honeywell, Sensi and other devices that require constant AC 24 volt power for operation etc. Note: the brand mentioned above is only for demonstrating compatibility.
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