Amazon is pushing out a new update to two of its Fire tablets: the Fire 7 and Fire HD 8. This over-the-air update in effect turns the tablets into hands-free Alexa speakers, which furthers the ubiquity of Amazon’s dominant AI voice assistant.
Amazon says that Alexa can be invoked when a Fire 7 or Fire HD 8 tablet is plugged into a power source

Source: Hot Hardware – Amazon Fire 7 And HD 8 Tablets Updated To Function As Hands-Free Alexa Speakers