24 volt transformer, c wire adapter thermostats, compatible with ecobee, nest and honeywell smart wifi thermostat, ring nest hello skybell august doorbell (white) hotop <br>specification: <br>input voltage: 120 v/ac, 60 hz; <br>output voltage: 24 v, 0.3 a/ ac <br>length: 23 feet/ 7 m <br>compatible with: devices that require 24 volt current for operation, such as smart thermostats of nest, honeywell, ecobee, hive, emerson sensi, etc. <br> <br>package includes: <br>1 x 24 volt adapter <br> <br>please note: <br>this is a compatible spare part and the manufacturers' names has been mentioned above for reference purposes only.