pxt-calliope/docs/reference/devices/on-signal-strength-changed.md
2016-04-01 16:22:47 -07:00

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# On Signal Strength Changed
The `on signal strength changed` function.
Register code to run when the signal strength of the paired device changes.
## Bluetooth required
The functions in the ``devices`` namespace allow the BBC micro:bit to communicate with a separate (remote) device, such as a smartphone, over Bluetooth (Smart).
The set of supported events will depend on the remote device and the BBC micro:bit apps available for the remote device.
### Block Editor
![](/static/mb/on-signal-strength-changed-0.png)
### KindScript
```
export function onSignalStrengthChanged(body:td.Action)
```
### Parameters
* ``body``: code to run when the signal strength changes.
### Examples
Display the signal strength on screen:
```
devices.onSignalStrengthChanged(() => {
basic.showNumber(devices.signalStrength(), 150)
})
```
### See Also
[tell remote control to](/microbit/reference/devices/tell-remote-control-to), [raise alert to](/microbit/reference/devices/raise-alert-to), [on notified](/microbit/reference/devices/on-notified), [signal strength](/microbit/reference/devices/signal-strength)