【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 in online meetings and calls is clearly delivered to the other party. This is a reliable connection essential for daily commutes. 【Intuitive Control with Touch Operation】: Adjust the volume with a light touch of your fingertips, and double-tap to play music or answer calls. With operation confirmation sounds, you can operate them 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 them 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, or during travel and 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 even after wearing them for more than an hour. 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 peace of mind for a long time. They are also ideal for light exercises such as running and walking, and will be your everyday companion. 【Palm-Sized, Comfortable to Carry Anywhere】: They fit neatly in cosmetic boxes and small bags, making them comfortable to carry anywhere, such as on commutes, to school, or on trips. Compatible with the Bluetooth 5.4 standard, they easily connect to iPhones, Android smartphones, as well as tablets and laptops. No dedicated app is required, and you can use them immediately from the standard Bluetooth function, making it easy to switch between family members and multiple devices. They are useful in all situations, whether you're out and about or at home.