Google Nest Power Connector

Nest thermostats are designed to work without a C wire in most homes.
But some systems may require a C wire for consistent power. The Nest
Power Connector is an easy alternative to adding one, and can be used
in HVAC systems with heat, cooling, or both heat and cooling
capabilities. It attaches directly to the furnace, air handler, or zone
controller without the need for any new wiring. And it’s affordable for
your customers.

Dimensions (Overall): 73 Millimeter (H) x 54 Millimeter (W) x 190 Millimeter (D)
Weight: 61.5 Grams
Industry or Government Certifications: No Certifications
HVAC Compatibility: Gas, Central AC, Oil, Electric
Compatible With: Google Assistant
Material: Plastic
Battery: No Battery Used