【Bluetooth 5.4 Communication, Stable Even on Trains】: These wireless earbuds automatically turn on when taken out of the case, and the initial connection is completed by simply selecting "K3" on your smartphone. Automatic pairing is done with no need for a single touch from the next time onwards. Even in crowded environments like commuter trains or cafes with many devices around, the stable communication up to 10 meters minimizes music interruptions, and your voice during online meetings and calls is delivered clearly to the other party. This is a reliable connection that is essential for daily commuting and going to school. 【Intuitive Control with Touch Operation】: Adjust the volume with a light touch of your fingertips, and double-tap to play music or answer calls. There is an operation confirmation sound, so you can operate it with peace of mind even while running or working from home with your hands full. Press and hold the right earbud to switch to low-latency game mode, reducing the lag between video and audio. Switch to high-quality listening mode when you want to enjoy music thoroughly. You can use it according to the scene. 【30-Hour Long Battery Life, Enough for a Day Out】: The earbuds alone can play continuously for about 4-5 hours, and with the charging case, you can use them for a total of up to 30 hours. They automatically charge when stored in the case, and the case itself is fully charged in about 1.5 hours. You can use them with peace of mind without worrying about the battery level on weekend hikes, long shopping trips, travel, or business trips. They are a reliable long-lasting companion for sudden outings and long online meetings. 【Perfect Fit for Your Ears, Comfortable & Durable Design】: The earbuds fit snugly in your ears with a shape that reduces pressure, making them comfortable to wear for more than an hour without causing ear pain. They are resistant to sweat and everyday use, and operate stably even in the summer heat or winter heating environments. Furthermore, the high-durability design prevents disassembly and modification, allowing you to use them with confidence for a long time. They are also ideal for light exercises such as running and walking, and will be your everyday companion.