Which one works with the Echo Dot 5th Gen?

Both do. Each lists Echo Dot 5th Gen, 4th Gen, and 3rd Gen, plus Echo Pop and Echo Dot with Clock, at 12V and 1.25A.

Which has the longer cable?

The Vebner adapter, at 17 feet versus 6 feet for the other charger. That matters if your outlet is far from where the speaker sits.

Do either work with the Echo Spot or Fire TV Cube?

Only the 6-foot charger lists Echo Spot (all generations), Fire TV Cube, and Show 5. The 17-foot adapter's compatibility list does not include them.

Are the power specs the same?

Yes. Both output 12V DC at 1.25A, or 15W, and both accept 100-240V input.

Is the longer cord worth paying more for?

Only if reach is your problem. If your outlet is close, the 6-foot charger covers more devices for the same job. Check the live prices above before deciding.

15W Extra Long Power Adapter Compatible with Amazon Echo Dot (3rd, 4th & 5th Generation), Amazon Echo Pop, Amazon Echo Pop Kids (17-Foot) vs 15W Power Cord Charger Replacement for Alexa Echo Spot, Echo Dot (3rd / 4th Gen / 5th Gen), Fire TV Cube, Show 5, Dot with Clock, Black

Buy the Vebner 17-foot adapter if cable reach is the deciding factor; its 17-foot cord lets you place an Echo Dot or Pop far from the outlet. Buy the 6-foot charger if you want a standard-length replacement and also own an Echo Spot or Fire TV Cube, which the longer cord's listing does not name. No prices were provided for either product, so compare current store prices on this page before deciding.

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