pxt-calliope/docs/reference/devices/on-signal-strength-changed.md

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# On Signal Strength Changed
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The `on signal strength changed` function.
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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.
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```sig
devices.onSignalStrengthChanged(() => {})
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```
### 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
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[tell remote control to](/reference/devices/tell-remote-control-to), [raise alert to](/reference/devices/raise-alert-to), [signal strength](/reference/devices/signal-strength)