Aqara - C-Wire Adapter for W200 Smartq Thermostat - White
Model: AC-X04E
SKU: 6674408
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The Thermostat C-Wire Adapter (also known as a common wire adapter, power extender kit, or C-wire transformer) provides a continuous source of power to a smart thermostat when your HVAC system doesn’t already have a dedicated C-wire (common wire).
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If your system doesn’t have a C-wire available, a C-wire adapter solves that by: Simulating or providing the missing C-wire connection and Ensuring your thermostat gets steady power without interfering with heating/cooling signals.