specification Mass: Approximately 6.5g (per piece) Bluetooth: Bluetooth.Ver5.3.class1.5 Supported profiles: TMAP, CSIP, MCP, VCP, CCP Communication distance: about 10m Power source: lithium ion battery Charging time: Earphone: Approximately 2 hours, Case: Approximately 3 hours (USB charging) Model: Sealed, dynamic Driver unit: 8.4mm Microphone: Mute function/Noise canceling function: Yes Splashproof/waterproof: IPX4 equivalent Accessories: Charging case, transceiver, USB cable, earpiece (not covered by warranty), reference guide, box