When you give a command to an Alexa speaker, a lot of the time, Alexa will say, "Okay," so long as she can carry out the task. Sometimes, however, you don't need a confirmation that she heard you. For instance, if you're trying to turn off or dim the lights after some people in your house have gone to sleep, you don't need Alexa to blurt out a way-too-loud "OKAY." Fortunately, you can now turn off the response from Alexa. To enable this, just say, "Alexa, turn on Brief Mode." Or you can manually enable it in the Alexa app by going to Settings > Alexa Voice Responses and toggling on Brief Mode. Alexa's responses will be much shorter and in some cases, this mode will play a short sound instead of a spoken response.