Specification: Type: Headphones Transmission distance: 10m Battery capacity: 400 mAh. Sensitivity: 105±3dB Speaker diameter: 40 mm. Charging time: approx. 2 hours. Built-in microphone: YES TF Card: Support Charging port: USB Song Switching: Support (short press the function button). Volume adjustment: Support (long press the function key). Answer call/hang up call: Support (short press the function key) Audio I/O interface: Support Package: 1 x P9 Bluetooth headphones. 1 x charging cable. 1 x Manual Note: Due to the difference between different monitors, the picture may not reflect the actual colour of the item. We guarantee the style is the same as shown in the photos. If you encounter logistical or product problems after purchase, please leave a message in time and we will help you solve them to your satisfaction.