Bluetooth 5.4 Compatible Bone Conduction Wireless Earphones ✅ Equipped with the latest Bluetooth 5.4 for stable connection and power saving ✅ Bone conduction method that doesn't block the ears, allowing you to hear ambient sounds for peace of mind ✅ Secure fit and IPX7 waterproof, making them difficult to dislodge during exercise ✅ Includes a 2200mAh large-capacity case: Up to 120 hours of playback + smartphone charging possible ✅ One-touch operation for easy music playback, calls, and voice assistant activation ✅ Automatic pairing: Connect simply by opening the case after initial setup ✅ Language switching: Tap twice during pairing to switch between Chinese/English Set Contents: ・Bone conduction earphones ・Charging case (2200mAh) ・USB-C charging cable ・Instruction manual Free shipping, anonymous delivery, and tracking available → Shipped via Yu-Packet Post within 1-2 days