Using Bluetooth 5.0 technology, the signal transmission is stable and the energy consumption is small. Built-in high-quality anti-interference microphone, external windproof sponge, can effectively realize hands-free answering and hanging up calls. The sound fidelity is high. Support up and down music, volume addition and subtraction, playback pause, automatic call back and other functions, easy to operate and easy to use. Built-in high-quality headphone speakers, strong bass, clear midrange, and pleasant treble. Built-in mini USB charging port, convenient and fast charging. Product model: BT8 Answering mode: automatic/manual Speaker specifications: diameter 30MM 32 Euro 0.5 Response frequency: 180-2000KHZ Sound-to-noise ratio: 80dB Bluetooth version: 5.0 Transmission distance: 10M (transmission distance varies due to environmental factors and mobile phone Bluetooth devices) Input : Bluetooth Charging voltage: USB 5V Lithium battery: 3.7V/180mA Material: ABS color: Black Package Contents: 1 x Earphone 1 x Charging Cable 4 x Nylon Buckle Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.