I purchased this on Mercari, but I haven't used it, so it's unopened. ★ Features "Mix Share" Allows simultaneous playback of musical instrument sounds and music from an audio player. An audio interface, such as an amplifier, is required when connecting an electric bass or electric guitar. "Versatile & High Sound Quality" Equipped with a 50mm driver using a strong neodymium magnet, ensuring a rich dynamic range. High input tolerance allows for stable playback even at high volumes. Ideal for live performances, DTM recording, and practicing musical instruments. Also recommended for ear training. "Breathability & Sound Isolation" Large-diameter ear pads that completely cover the ears and moderate side pressure provide both comfortable wear and high sound isolation. Leather ear pads with high-density memory foam provide warmth and breathability, keeping ears warm in winter and reducing heat and humidity in summer. Ergonomic headband design provides a perfect fit without pressure on the ears or head.