Google Nest Power Connector Nest Thermostat C Wire Adapter Brand New, Box Only Opened for Pics Provides Thermostat Power For Homes W/O a C Wire Works With the Nest Thermostat. Nest Thermostat E, and Nest Learning Thermostat (3rd gen) 24 VAC Systems Only. Millivolt or High Voltage Systems Are Incompatible. New In Box… Only Opened To Take Pics