pxt-calliope/docs/reference/devices/receive-number.md

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# Receive Number
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The broadcast function.
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Reads the next radio packet as a number data packet.
## Important Security Consideration
The functions in the ``radio`` namespace allow the BBC micro:bit to communicate with other micro:bits.
This API does not contain any form of encryption, authentication or authorization. It's purpose is solely for use as a teaching aid to demonstrate how simple communications operates, and to provide a sandpit through which learning can take place.
For serious applications, BLE should be considered a substantially more secure alternative.
### Block Editor
![](/static/mb/receive-number-0.png)
### KindScript
```
export function receiveNumber() : number
```
### Returns
* packet - a number received.
### Examples
Broadcasts the value of ``acceleration`` x to other micro:bits.
```
radio.onDataReceived(() => {
led.plotBarGraph(radio.receiveNumber(), 1023)
})
```
### See also
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[send number](/reference/radio/send-number), [receive number](/reference/radio/receive-number), [on data received](/reference/radio/on-data-received), [set group](/reference/radio/set-group)
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