This adaptor is specially made to power your LockState Connect Programmable Thermostat.
FROM THE MANUFACTURER
LockState Connect WiFi Programmable Thermostat Power Adaptor, 24 VAC
The 24VAC power adapter will provide power to the LS-60(i) and LS-90(i) from any standard electrical outlet. This can be used if you do not have an existing C-Wire coming up from your furnace to your thermostat. This transformer converts 110VAC to 24VAC for use with LS-60(i) and LS-90(i) thermostats. Simply connect one end to the "Rh" terminal and the other end to the "C" terminal. You can connect either wire to either terminal (there is no polarity).
Provides 24V power when plugged into a standard 110 wall outlet
Complete with 20 foot cord
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