Description:1. bluetooth V4.1+EDR,the longest transmitter distance is 10 meters.2. Support bluetooth handsfree call and answer function.3. Support A2DP.4. Support TF card playback function.5. Frequency: 2.4GHz6.3.5mm stereo audio output.7.Sleep mode, energy saving.8. It would continnue working for 8 hours.Package Included:1 X iMars X6 Carbluetooth Receiver1 X USB Cable1 X User Manual