Specifications: Color: Black;  Bluetooth Version: V5.0;  Operation Range: 20m;  Play Time: 6 hours;  Standby Time: 300 hours;  Charging Time: 2 hours;  Noise Reduction: CVC6.0;  Frequency response: 20-20000Hz;  Operating voltage range: 3.0 V-4.2 V;  Microphone sensitivity: -42dB;     Features: 1. Adopt true wireless technology, enjoy your wireless sports.  2. With portable charging box design, it can keep full battery state.   3. Binaural hands-free calling, automatic switch. Integrated microphone for clear calls.  4. IPX5 waterproof design for which it will be available when wearing in a rainy day and gym.  5. Superior sound quality. With intelligent noise reduction technology, the item can deliver high quality music and enjoyable listening experience for compatible devices.  6. Comfortable to wear, ergonomic design and with no pain for long time wearing, it will not fall off when running.  7. Strong Wireless Signal. You can enjoy skip-free music in a 20-meter working distance.  8. Strong compatibility and compatible with IOS Android devices.     Package Included: 2 x Mini Wireless Earbud;  1 x Charging Box;  1 x USB Cable;  1 x User Manual