Most devices with Alexa allow users to activate the device using a wake-word (such as Alexa); other devices (such as the Amazon mobile app on iOS or Android and Amazon Dash Wand) require the user to push a button to activate Alexa's listening mode. Currently, interaction and communication with Alexa are available only in English, German, French, Italian, Spanish, Portuguese, Japanese, and Hindi. In Canada, Alexa is available in English and in French (with the Québec accent).
By default, Echo devices use “Alexa” as their wake word. While the device is constantly listening, it only starts tracking and analyzing what you say next after it hears “Alexa.” It then pulls up the relevant results. However, if, say, someone in your house is already named Alexa, you can change the wake word to something else: Amazon, Echo, or Computer.
There are a number of ways messages can be sent from Alexa's application. Alexa can deliver messages to a recipient's Alexa application, as well as to all supported Echo devices associated with their Amazon account. Alexa can send typed messages only from Alexa's app. If one sends a message from an associated Echo device, it transmits as a voice message. Alexa cannot send attachments such as videos and photos.