✨ Free Shipping ✨ Anonymous Delivery via Mercari ✨ Instant purchase welcome Brand new, unused. Leveraging the latest Bluetooth 5.4 technology, the performance of these Bluetooth earphones has been upgraded. Key improvements: They achieve quick pairing and automatic connection, allowing you to use them immediately after taking the earphones out of the charging case, without any troublesome procedures. The adoption of Bluetooth 5.4 technology reduces external interference, providing clearer and more accurate sound quality, allowing you to enjoy immersive sound. Bluetooth 5.4's excellent energy efficiency also enables long-lasting use. You can freely use these Bluetooth earphones even when you're out and about, without worrying about the number of charges. Equipped with a high-performance microphone for comfortable calls: Equipped with a high-performance microphone that delivers clear call audio, you can use it for web conferences, Zoom, and LINE calls during telework. Rich and immersive sound: The "S3" open-ear earphones are equipped with a 16mm extra-large driver and directional acoustic technology, maintaining the resolution of the music despite being open-ear. The rich bass and clear treble are exquisitely balanced, providing powerful audio performance. It faithfully reproduces natural sound quality as if you were there, making the music deeper and giving you a dynamic sense of emotion. Secure ear hook design: The soft, skin-friendly silicone material and the 1.0mm ultra-thin shape-memory titanium ear hook design inside the ear cuff earphones fit perfectly to the shape of your ear, no matter how intense the activity. Thank you for viewing! ^_^