Noise ReductionScans incoming audio for sound outside of the user’s voice range and removes it from the call.Echo CancellationRemoves feedback that can occur between the microphone and speaker， particularly during conference calls.Audible Pairing AssistanceOffers user voice-guided information when pairing the Bluetooth headset with a handset.Auto-ReconnectThe Bluetooth headset automatically reconnects to a previously paired handset as soon as it comes back within range.Specifications Bluetooth version: V4.0+EDR Battery: 3.7V/180mAh Support profiles: Headset， handfree Power source: Built-in Rechargeable Li-Battery