The blue light on your Echo device will light up whenever Alexa is listening for a follow-up question. Now, Amazon has a new feature called "Follow-up Mode" that's created to make exchanges like that feel a lot more natural. However, if you want to give multiple commands one after the other, it can be a nuisance to say "Hey, Alexa" over and over again before every command.
The basic idea is simple, and a little bit obvious in hindsight.
Devices like the Echo and Echo Dot will give users five seconds to hit it with a follow-up question after it answers your first one, lighting up blue to indicate that it's still listening. "She didn't even say anything, just laughed". This means that the user will have to clearly issue the command because if they don't, Alexa probably won't separate it from the background noise. You can't, for instance, say "Alexa, turn off the lights and set the thermostat to 68". Just head to the Settings page of the app, select the device you want to configure, find Follow-Up Mode and tap the toggle to switch it on. ALEXA: "OK, the heat is set to 68". Also, Alexa won't respond until it's "confident you're speaking to" it.
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The new feature is called Follow-Up Mode, and it has to be enabled by users before it can be used. They can end their conversation with Alexa by simply saying "thank you", "stop", "cancel", or "go to sleep". The feature appears to be an option for the entire Echo lineup, as well as some third-party Alexa devices, though it's now only available for US English.
Take note, though, that your speaker won't wait for a follow-up if it's in the middle of playing music or audiobooks.