・ Improves concentration ・ Reduces noise for children's ears ・ Protects sensitive ears of children Awarded 1st place on Rakuten Recommended by pediatricians Purchased new in early November 2025 and tried on, but I ended up using something else, so I no longer need this. It received good reviews and I was satisfied, but I won't be using it often, so I'm selling it. ※ Cannot be connected to any devices. ※ Only the main unit, no box or instructions.