Amazon Echo (shortened and referred to as Echo) is a brand of smart speakers developed by Amazon.com. The devices connect to the voice-controlled intelligent personal assistant service Alexa, which responds to the name "Alexa". This "wake word" can be changed by the user to "Amazon", "Echo" or "Computer".
The device is capable of voice interaction, music playback, making to-do lists, setting alarms, streaming podcasts, playing audiobooks, and providing weather, traffic and other real-time information. It can also control several smart devices acting as a home automation hub.
Amazon had been developing Echo devices inside its Lab126 offices in Silicon Valley and Cambridge, Massachusetts since at least 2010 in confirmed reports.
The device was part of Amazon’s first attempts to expand its device portfolio beyond the Kindle e-reader. The Echo was prominently featured in Amazon's first-ever Super Bowl ad in 2016
The first-generation Echo was initially limited to Amazon Prime members or by invitation, but became widely available in the United States on June 23, 2015. Press speculated that it would make its Canadian debut in mid-to-late 2016, after Amazon posted job listings for developers for Alexa and co-hosted a hackathon in Toronto.
The Echo became available in the United Kingdom on 28 September 2016. Additionally, the Alexa voice service is available to be added to other devices and other companies' devices and services are encouraged to connect to it.
The first-generation Amazon Echo consists of a 9.25 inch (23.5 cm) tall cylinder speaker with a seven-piece microphone array. The Echo hardware complement includes a Texas Instruments DM3725 ARM Cortex-A8processor, 256MB of LPDDR1 RAM and 4GB of storage space.
Although the Echo is intended to be voice-controlled at the unit, a microphone-enabled remote control similar to the one bundled with the Fire TV is available for purchase. An action button on top of the unit is provided for user setup in a new location, and the mute button allows the microphones to be turned off. The top half-inch of the unit rotates to increase or decrease the speaker volume. The Echo must be plugged in to operate since it has no internal battery.
Echo provides dual-band Wi-Fi 802.11a/b/g/n and Bluetooth Advanced Audio Distribution Profile (A2DP) support for audio streaming and Audio/Video Remote Control Profile (AVRCP) for voice control of connected mobile devices.
Amazon Echo Silver does not exist :) It was a comedy sketch from Saturday Night Live.
Source : http://www.nbc.com/saturday-night-live
Source : https://en.wikipedia.org/wiki/Amazon_Echo