review: useless device waste money work register wifi amazon not come signal alexa app computer mobile no one else house use if register wifi not available time not register two three signal alexa become use less no internet lot restrictions like hand free not available battery saver mode etc etc many time not understand voice many apps miss window computer if instruct teach gramer children not useless device even want buy fire tv stick but lot use market hence think must problem like also hence stop purchase advice amazon make user friendly not restrict one wifi signal take come signal allow us register two three signal not restrict hand free etc regardsravishankar