【Brand New & Unopened】ANKER Soundcore Liberty 4 Wireless Earphones Delicate and Rich Sound: Equipped with Anker's proprietary driver "A.C.A.A 3.0," these earphones deliver a delicate and rich sound quality, allowing you to hear even the finest sounds clearly. They also support the high-quality audio codec LDAC. 3D Audio for a 360° Sound Experience: The unique algorithm processes sound sources in real-time, providing an immersive sound experience like being in a live venue or movie theater. They also feature head-tracking that detects and follows head movements. Ultra Noise Cancelling 2.0: Anker's proprietary Ultra Noise Cancelling 2.0 automatically adjusts the intensity of noise cancellation. They also feature wind noise reduction. Health Monitoring: You can use heart rate monitoring, stress checks, posture reminders, workout functions, and more. This product is also IPX4 water-resistant. Package Contents: Earphone unit, charging case, ear tips (4 sizes), USB-C & USB-A cable, quick start guide, safety manual, product certified with the Technical Conformity Mark (Frequency band: 2.40〜2.48GHz) Thank you!