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It is not an extension.<br />
<br />
It is basically the same device but more importantly is a lot cheaper.<br />
<br />
There are improvements but again the cost is the most important factor.<br />
<br />
Go read here <a href="https://turbofuture.com/consumer-electronics/Why-Amazons-Echo-Dot-Is-Better-Than-Amazon-Echo" rel="ugc">https://turbofuture.com/consumer-electronics/Why-Amazons-Echo-Dot-Is-Better-Than-Amazon-Echo</a>&nbsp;for more details.
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It is not an extension.

It is basically the same device but more importantly is a lot cheaper.

There are improvements but again the cost is the most important factor.

Go read here https://turbofuture.com/consumer-electronics/Why-Amazons-Echo-Dot-Is-Better-Than-Amazon-Echo [https://turbofuture.com/consumer-electronics/Why-Amazons-Echo-Dot-Is-Better-Than-Amazon-Echo] for more details.

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Joe Winograd has added substantially to this thread.<br />
<br />
I'd like my comment on closing this question removed.
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Joe Winograd has added substantially to this thread.

I'd like my comment on closing this question removed.

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What is the benefit of ordering Echo vs. Dot? I already have an Echo, but would dot be an extension? Does anyone have both?
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What is the benefit of ordering Echo vs. Dot? I already have an Echo, but would dot be an extension? Does anyone have both?

Echo vs Dot?

A peripheral device is defined as a computer device, such as a keyboard or printer, that is not part of the essential computer (i.e., the memory and microprocessor). These auxiliary devices are intended to be connected to the computer and used in conjunction with it. Examples of external peripherals include mouse, keyboard, printer, monitor, external Zip drive or scanner, while internal peripherals include CD-ROM drive, CD-R drive or internal modem. Today's new devices, such as tablets, smartphones and wearable computing devices are considered peripherals as they can be connected and used on a computer system. The difference, however, is that these devices can run independently of the computer system.