---
title: "sendDTMF(_:)"
framework: IOBluetooth
role: symbol
role_heading: Instance Method
platforms: [macOS 10.7+]
path: "iobluetooth/iobluetoothhandsfreedevice/senddtmf(_:)"
---

# sendDTMF(_:)

Sends the tone associated with a phone key to the hands-free Bluetooth device.

## Declaration

```swift
func sendDTMF(_ character: String!)
```

## Parameters

- `character`: The phone keypad character for the tone. The character must be one of the following: 0-9 # * A-D

## See Also

### Sending Messages and Commands

- [sendSMS(_:message:)](iobluetooth/iobluetoothhandsfreedevice/sendsms(_:message:).md)
- [send(atCommand:)](iobluetooth/iobluetoothhandsfreedevice/send(atcommand:).md)
- [send(atCommand:timeout:selector:target:)](iobluetooth/iobluetoothhandsfreedevice/send(atcommand:timeout:selector:target:).md)