The color(s) gray, red, blue and yellow is/are claimed as a feature of the mark.
The mark consists of the phrase LISTEN HUB, in upper-case letters, in the color gray. Centered above the phrase LISTEN HUB are two squares, one, on the left, in the color red and one, on the right, in the color blue. Centered above the red and blue squares is a square in the color yellow. The three squares give the impression of being two sides and the top of a cube.