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

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# On Bluetooth Disconnected
![](/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 connect to the micro:bit. 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
[![micro:bit Bluetooth demo video](/static/bluetooth/microbit_on_disconnected.png)](
http://www.youtube.com/watch?v=HyBcsD9Eh6I "Click to launch YouTube video"
)
### See also
[Bluetooth SIG](https://www.bluetooth.com)
[Bluetooth on micro:bit resources](http://bluetooth-mdw.blogspot.co.uk/p/bbc-microbit.html)