2016-06-08 20:21:58 +02:00
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# Received Signal Strength
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Find how strong the ``radio`` signal is, from `255` to `0`.
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(`255` means a weak signal and `0` means a strong one.)
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The micro:bit finds the signal strength by checking how strong it was
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the last time it ran the
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[receive number](/reference/radio/receive-number) function. That means
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it needs to run **receive number** first.
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### Returns
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* a [number](/reference/types/number) between `255` and `0` that means
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how strong the signal is.
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2016-06-10 00:30:47 +02:00
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### Simulator
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2016-06-08 20:21:58 +02:00
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This function only works on the micro:bit, not in browsers.
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### Example
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This example shows how strong the radio signal of the
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[light level sender example](/reference/input/send-number) is.
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```blocks
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let x = 0;
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radio.setGroup(99);
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basic.forever(() => {
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x = radio.receiveNumber();
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basic.showNumber(radio.receivedSignalStrength());
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});
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```
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### See also
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[receive number](/reference/radio/receive-number), [send number](/reference/radio/send-number), [on data received](/reference/radio/on-data-received)
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