A Special Sound

Riddle: I repeat only the last word you say. The more I repeat, the softer I got. I cannot be seen but can be heard. What am I?

Answer: An Echo.

Source: https://www.riddles.com/index.php/2569

I repeat only the last word you say. The more I repeat, the softer I got. I cannot be seen but can be heard. What am I? — A special sound by NEO JIA QI v1.

Riddle: I repeat only the last word you say. The more I repeat, the softer I got. I cannot be seen but can be heard. What am I? Answer: An Echo. — by NEO JIA QI v2.