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Amazon.com: Newhouse Hardware 40TR 24-Volt 40vA Wired Door Bell Transformer for Powering Multiple Smart Doorbells and Thermostats, Gold : Everything Else
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HQRP Tri-Volt (8V 20VA, 16V 30VA or 24V 30VA) Transformer Compatible with Ring, Nest and Standard Doorbells Door Chime Power Supply Adapter Door-Bell 120v-to-8v-16v-24v Replacement, UL Listed - - Amazon.com
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24 Volt Transformer, C Wire Adapter Thermostat, Compatible with Nest, Ecobee, Honeywell Smart Thermostat, Nest Hello, Ring Doorbell Power Supply (23ft Cable) - - Amazon.com
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