The Echo line of Alexa enabled products stand alone. There is a support
app though called the Alexa Ap for smart phones which permits one to
tweak some features of the Echo and Alexa products. There is also a web
based app for this purpose, but most blind people find it really
difficult to use.
As far as which is best? Depends on your desired use. The Echo Dot is
by far the cheapest, and has all the capabilities, but a poor speaker.
However, it does have both blue tooth and a mini jack output so you can
tie it into a good stereo system and it sound great. If all you need is
a controller for Alexa enabled appliences, and you don't plan to play
music on it, the Dot is fine.
The Echo 2 is a good sounding stand alone speaker with plenty of
volume. It too can be connected to a stereo or blue tooth device though
if you want.
The Echo Plus has a built in smart device controller, so you won't need
a hub for lights, locks or thermostadts.
The Echo Show has a screen, is comparatively expensive, and of no use
in my book for a blind person.
The Echo Spot is basically a clock radio concept, and not worth its
extra costs.
The Fire TV also has Alexa, and is fully accessible. It can control
video streaming, but can also provide all the Alexa music and command
services. It must be tied to a television though to function as it uses
the TV speakers.
I have three Echos. Two Dots, both tied to stereo systems, one in my
living room, one in my music studio, and then a regular Echo in my
bedroom. They can all function together, or separately. I also have a
Fire TV. I am totally hooked on the Echo and Alexa products. I shop
through them all the time. I love the music service, and the games and
look up functions are very useful. I have not tried them as appliance
controllers as yet.
HTH
Bill
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