Description: Features: Handsfree Call BT Program: 5.4 Frequency: 2.4GHz-2.48GHz Transmit Distance: ≤ 10 meters Receive Distance: ≤ 10 meters Receive Function: Connect to 1 Mobile Phone Transmit Function: Connect to 1 Pair of BT Headset / BT Audio Battery Capacity: 180mah Charging Time: Approx. 2 Hours Playback Time: Approx. 10 Hours (Receive Mode),Approx. 8 Hours (Transmit Mode) Built-in HD noise-canceling call effect, support AAC/SBC audio decoding, bend-resistant audio plug, lightweight to use, can be carried around 3.5mm aux universal interface, suitable for a variety of audio devices Package List: BT Adapter *2 cable *2 manual *2 Notice: 1.The actual color of the project may be slightly different from the picture displayed on the website due to many factors such as the brightness of the display and the brightness of the light.I sincerely hope you can understand. 2.The size is manually measured, and there may be an error of 0.2-0.5cm, which is a normal phenomenon.