The challenge of this design is to ensure the practicability of increasing the volume while replaying the command.
While waiting for the device's response, user can click the tip button to check if the device is listening. Or he can also replay the command.
For solution 1, I used the iphone to record a command "Alexa, tell me about the weather" and set the volume to scale 2. Then replayed the command to Echo. If Echo couldn't hear it, then increase the volume by 2 scale and replay the command again. It took 3 times of replays to finally let Echo hear the command. For solution 2, after Echo couldn't hear the command, the volume would be increased to maximum and replay the command. It only took one time of replay to let Echo hear.