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# handsFree(_:signalStrength:)

Tells the delegate the call setup signal strength indicator of the connected Bluetooth hands-free phone or headset has changed.

```
optional func handsFree(_ device: IOBluetoothHandsFreeDevice!, signalStrength: NSNumber!)
```

## Parameters

`device`

The connected Bluetooth hands-free phone or headset.

`signalStrength`

The new value of the signal strength indicator. For possible values, see [`IOBluetoothHandsFreeIndicatorSignal`](/documentation/IOBluetooth/IOBluetoothHandsFreeIndicatorSignal).

## Discussion

---

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