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N1 Common C Wire Adapter AC Transformer 24V 500mA Universal Compatible With WIFI Smart Thermostat and Doorbells. Nest, Ring, Honeywell, Ecobee, Sensi - White, New - Walmart.com
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C Wire Adapter 24 Volt Transformer Compatible with Nest Honeywell Ecobee Emerson Sensi Smart WiFi (White) - - Amazon.com
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