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Chime Pro Wi-Fi Extender and Indoor Chime for Ring Devices - Blanco
Extend the reach of your Ring doorbell with the Chime Pro Wi-Fi extender. It plugs into standard electric outlets and boosts the network signal of your Ring so you'll always know when someone is at your door. This Chime Pro Wi-Fi extender has a convenient volume control and issues multiple alert tones for optimal versatility.
Can the Wi-Fi Extender be plugged into an extension cord?
Have not tried it, but I believe it would. Orientation might be a challenge.