Audible tones (beeping) heard while the headset is in use could be caused the following: The battery is low. The active call was dropped. A volume button has been pressed.
Talk/standby time Up to 24 hours talk and listen time; 6 months standby; Bluetooth v4.0 Headset/Hands-Free Profile HSP 1.2 and HFP 1.6 (Wideband HD Voice); Class 1 BT Radio