With new upgrade BT chip, this BT wireless earphone is perfect for fitness fanatic in need of hands-free calls and long-time standby when taking exercise. Features: Striking appearance, fine and smooth, different colors for the unique you. BT 5.0 wireless connection with high fidelity enables data transmission within 10 meters to achieve the effect of original sound. Ergonomic in-ear design with soft earbuds, perfectly fits your ears, without the earache caused by long-time wearing. Comes with ergonomic ear domes to tightly fit different ear types without the worry of falling out and lost. Built-in mic and 10mm high-end speaker is capable of reducing the noise of wind and background to transmit sound and voice clearly. The capacity of mini charging box reaches 750mAh, which is convenient for charging, storage and easy to carry. With battery capacity of 60mA, 1 hours fully charged meets 6 hours normal use of call and music playing. Specifications Earphones; BT version: 5.0; Impedance: 16 ; Power: 5 mW; Frequency range: 20 Hz 20 KHz; Speaker sensitivity: 101 dB at 1 kHz; Microphone sensitivity: -38 dB at 1 kHz; Weight: 5.8g per earphone; Capacity: 60 mAh per earphone; Charging box; Capacity: 750 mAh; Type: Lithium polymer battery; Weight: Approx. 48g (earphones excluded); Package lists 1 x Pro Earphone; 1 x Use Instruction