pxt-calliope/docs/reference/bluetooth/on-bluetooth-disconnected.md

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# On Bluetooth Disconnected
### ~hint
![](/static/bluetooth/Bluetooth_SIG.png)
For another device like a smartphone to use any of the Bluetooth "services" which the micro:bit has, it must first be [paired with the micro:bit](/reference/bluetooth/bluetooth-pairing). Once paired, the other device may connect to the micro:bit and exchange data relating to many of the micro:bit's features.
### ~
This block starts an [event handler](/reference/event-handler) which in this case will run when a device which is connected to your micro:bit over Bluetooth disconnects.
You could use this event handler to display a letter "D" on the micro:bit LED grid so you know that the Bluetooth connection has been closed.
```sig
bluetooth.onBluetoothDisconnected(() => {
});
```
### Example: Displaying "D" when a Bluetooth connection to the micro:bit is closed
```blocks
bluetooth.onBluetoothDisconnected(() => {
basic.showString("D");
});
```
### Video - on Bluetooth disconnected
http://www.youtube.com/watch?v=HyBcsD9Eh6I
### See also
[Bluetooth SIG](https://www.bluetooth.com), [Bluetooth on micro:bit resources](http://bluetooth-mdw.blogspot.co.uk/p/bbc-microbit.html)
```package
microbit-bluetooth
```