BlueAnt S4 True Handsfree - Manual (Page 30)

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Specifi cations
> Bluetooth version 2.1 + EDR
> Supported Profi les: HFP 1.5, A2DP 1.2
> Operating Range: Up to 10 meters
> Frequency: 2.4 GHz
> Talk Time: Up to 20 hours
> Standby Time: Up to 700 hours with handsfree trigger in battery saving mode
> Charging Time: 3 - 4 hours
> Battery Type: Rechargeable Lithium Ion