NEW YORK (TheStreet) -- Amazon (AMZN) is continuously updating its innovative speaker, Amazon Echo, and now it's taking things one step further -- the ability to order products on the website by voice.

Amazon Echo, which is still available by invitation only, will allow only Amazon Prime members (at least initially) to purchase items from Amazon using a voice command. If a customer wanted to order toilet paper or something a user had ordered previously, all they would need to do is say "Wake," and subsequently, say the name of the product, with Echo searching through your order history and ordering the product for you.

The service only works with goods that are eligible for Prime, Amazon's $99-a-year shipping and entertainment service, and users need both a U.S. billing address and a U.S.-based payment.

If Echo finds what you're looking for, it'll ask you if you want to order and ask for your voice code. If you haven't created a confirmation code, it'll ask you if you want to order anyway. If the device, priced at $199, is unable to find what you're looking for, it'll offer up an alternative, from Amazon's Choice, giving you pricing details and then asking you if you want to order it.

For a full list of instructions, see Amazon's Echo website.

Echo, which was first introduced in Nov. 2014, has long been thought of a move to make buying goods from the company easier, despite its limited availability. TheStreet requested a review sample of the Echo and was told the only way to get one was via invitation.

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