Thank you for viewing. Anker Soundcore Liberty 4 Midnight Black ⚫︎ Delicate and Rich Sound Equipped with Anker's proprietary driver "A.C.A.A 3.0," it achieves a delicate and rich sound quality where even subtle sounds can be heard clearly. It also supports high-quality codec LDAC. ⚫︎ 360° Sound Experience with 3D Audio The unique algorithm processes sound sources in real-time, providing an audio experience like being in a live venue or movie theater. It also features head-tracking that detects and follows head movements. ⚫︎ Ultra Noise Cancelling 2.0 Anker's proprietary Ultra Noise Cancelling 2.0 automatically adjusts the strength of noise cancellation. It also features wind noise reduction. ⚫︎ Health Monitoring You can use heart rate monitoring, stress checks, posture reminders, workout functions, etc. This product also supports IPX4 waterproof standards. Brand new, unused item.