If you're talking about Alexa specific then log in to your Alexa account and they list all brands that work with Alexa. Same thing with Google assistant. They basically are apps that can control wifi devices from different manufacturers via voice commands.
If you're using the term Alexa to describe wifi control then there are many, many devices available for 12vdc that may require a different phone app to control.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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