pxt-calliope/docs/reference/radio/received-signal-strength.md

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# Received Signal Strength
Find how strong the ``radio`` signal is, from `255` to `0`.
(`255` means a weak signal and `0` means a strong one.)
The micro:bit finds the signal strength by checking how strong it was
the last time it ran the
[receive number](/reference/radio/receive-number) function. That means
it needs to run **receive number** first.
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```sig
radio.receivedSignalStrength();
```
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### Returns
* a [number](/reference/types/number) between `255` and `0` that means
how strong the signal is.
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### Simulator
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This function only works on the micro:bit, not in browsers.
### Example
This example shows how strong the radio signal of the
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[light level sender example](/reference/radio/send-number) is.
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```blocks
let x = 0;
radio.setGroup(99);
basic.forever(() => {
x = radio.receiveNumber();
basic.showNumber(radio.receivedSignalStrength());
});
```
### See also
[receive number](/reference/radio/receive-number), [send number](/reference/radio/send-number), [on data received](/reference/radio/on-data-received)