Assertion: thermostat's battery | /r/HasProperty | installed
Facets:
value: typically
type: DEGREE
Source sentences:
text: Typically one or more regular batteries must be installed to operate it, although some so-called "power stealing" digital thermostats use the common 24 volt AC circuits as a power source, but will not operate on thermopile powered "millivolt" circuits used in some furnaces.