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Brand: Yinyuanai/Yinyuanai Wearing method: in-ear Waterproof level: IPX4 Headphone category: true wireless headset Noise reduction function: passive noise reduction (physical noise reduction) Life time: 2 hours (inclusive)-4 hours (not included) Transmission distance: 8m (inclusive)-10m (not included) Bluetooth function: Bluetooth 5.0Jiu Shikang ice pack eye mask hot pack double eyelid postoperative cold pack ice pack to reduce swelling and eye protection to relieve eye fatigue