Connect the ordinary headset with this Bluetooth receiver via the 3.5mm audio jack, your headset easily become to a Bluetooth headset. Then use the headset for hands-free calling, music playing. - Model: DSIT022- Output: Standard 3.5mm aux interface- Working distance: 8-10m- Battery capacity: 120mAh- Charging time: about 2 hours- Working time: about 8 hours- Standby time: 30 days- The headset impedance: 16ohms                                                                        - Headphones frequency response:10-44000KHz                                           - The headset sensitivity:108dB- The headset line length:70cm #!