<ul><li>Bluetooth receiving range:10 meters</li><li>Bluetooth version:5.2</li><li>Noise Reduction Version: CVC8.0</li><li>Battery capacity:280MAH</li><li>Call playback time:about 8 hours</li><li>Power input: DC5V/1A</li><li>Charging time:2 hours</li><li>We will try our best to give you best serice</li><li>Bluetooth products will be strictly inspected before shipment</li><li>But products may run out of power during transportation.</li><li>Please charge it for half an hour after receiving the product before connecting it to the phoneAny problem please feel free to contact us</li><li>We will very appreciate if Give us five stars review</li></ul>