The Tenori-On includes four built-in stereo speakers: two on the front; and two on the back. The included speakers are loud enough for casual jamming, but to really hear what the Tenori-On is capable of you need to plug into the instrument's 3.5mm headphone jack.
A Clear button located between the two speakers wipes the currently selected pattern from the Tenori-On's memory. The button is useful for making a clean start after a disappointing composition. Thankfully, the button is placed far enough out of the way to not be triggered accidentally.
Photo credit: CNET Networks/Corinne Schulze