pxt-calliope/docs/reference/radio/send-number.md

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# Send Number
Broadcasts a number data packet to other micro:bits connected via ``radio``.
## 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.
```sig
radio.sendNumber(0)
```
### Parameters
* packet - a number to be transmitted.
### Examples
Broadcasts the value of ``acceleration`` x to other micro:bits.
```blocks
input.onButtonPressed(Button.A, () => {
radio.sendNumber(input.acceleration(Dimension.X))
})
```
### See also
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[receive number](/input/receive-number), [on data received](/reference/radio/on-data-received)
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