This is the Kumon E-pencil. I purchased it officially about 6 years ago, but since I was using the one at the classroom, I kept it at home almost unused. I haven't confirmed the operation, but I've included a picture of the batteries I used (on the third image) just in case. Blue E-Pencil with audio playback function, volume adjustable. - Brand: KUMON - Model Name: E-Pencil - Color: Blue - Functions: Audio playback button, volume control button