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# On Bluetooth Disconnected
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### ~hint
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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.
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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.
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```sig
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bluetooth.onBluetoothDisconnected(() => {
});
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```
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### Example: Displaying "D" when a Bluetooth connection to the micro:bit is closed
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```blocks
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bluetooth.onBluetoothDisconnected(() => {
basic.showString("D");
});
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```
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### Video - on Bluetooth disconnected
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http://www.youtube.com/watch?v=HyBcsD9Eh6I
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### See also
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[Bluetooth SIG ](https://www.bluetooth.com ), [Bluetooth on micro:bit resources ](http://bluetooth-mdw.blogspot.co.uk/p/bbc-microbit.html )
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```package
microbit-bluetooth
```