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docs/reference/devices/signal-strength.md

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+# Signal Strength
+
+The `signal strength` function. #docs #antenna #ble
+
+Returns the signal strength reported by the paired device from ``0`` (no signal) to ``4`` (full strength).
+
+## 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/signal-strength-0.png)
+
+### KindScript
+
+```
+export function signalStrength() : number
+```
+
+### Returns
+
+* the signal strength from ``0`` (no signal) to ``4`` (full strength).
+
+### 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), [on signal strength changed](/microbit/reference/devices/on-signal-strength-changed)
+