Purchased August 28, 2025. Used for about a month. I am selling these because they don't suit me. As shown in the photo (15th photo), there are minor scratches from use. There are no functional problems. Audio-Technica ATH-CKS30TW+ BK Wireless Earphones True Wireless Bluetooth Noise Cancelling Black [Reference] ● "Heart, Body, and Sound that Takes You Away" with overwhelming low-frequency expression. Features a uniquely designed Φ9mm driver and acoustic spaces and ducts that control airflow. It achieves both overwhelming deep bass and balanced mid-high frequencies, allowing you to enjoy music and videos with a sense of realism as if you were at a live performance every day. ● Equipped with a noise-canceling function to pursue your passions. Equipped with a feed-forward active noise-canceling function. It suppresses the noise around you, such as the sound of air conditioning at home and the sounds of trains and buses during your commute, allowing you to instantly immerse yourself in your favorite music and videos. ● Activate the ultra-low frequency equalizer and enjoy the lingering sound of the low frequencies. When you want to immerse yourself in powerful deep bass, simply turn ON the CKS30TW+ exclusive preset equalizer "Bass Boost -Deep". You can expand the "ultra-low frequency" range, which is lower than the normal equalizer adjustment range. You can dive into a world of deep bass that you wouldn't imagine from such small earphones. ● JIS protection rating: IP55 equivalent (earphones only). ● Hear-through function that allows you to listen to music with a BGM feel while naturally taking in outside sounds. ● Talk-through function that allows you to have conversations and hear announcements while wearing the earphones. ● Anti-loss alert to prevent losing your earphones. ● "Find Product" function that displays the location of the earphones on a map. Displays the last location information where the earphones were disconnected from the Bluetooth connection on the map of the dedicated "Connect" app. ● Ultra-slim charging case that fits smartly in your pocket. ● Low-latency mode to reduce the delay between sound and video / Soundscape function to support concentration and rest / Low-latency mode to reduce the delay between sound and video