Purchased at Kojima about two years ago and used only once. After use, it was stored in its box and kept at home. This is a single-ear type, ideal for long hours of use via USB connection. My impression after using it was that it was light and comfortable, without causing any ear pain. Volume adjustment and mute can also be controlled with the in-line controller. - Brand: ELECOM - Connection method: USB - Driver unit: 30mm - Microphone type: Single-ear type - Cable length: 1.8m ◉ Although used once, it is almost new. ◉ The warranty period has expired, and there is no receipt from the purchase. ◉ There may be stains, scratches, or oversights that cannot be confirmed in the images. Please refrain from purchasing if you are sensitive to these issues or if you are seeking a perfect product. ◉ I will be handling business during work hours, so it may take some time to respond to messages and ship the item.