pxt-calliope/docs/reference/radio/set-transmit-power.md

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# Set Transmit Power
Sets the transmitter power for ``radio`` communications.
The power can be set to a value between 0 (-30dbm) and 7 (+4dbm).
## Range
At power level 7, in an open area without significant interference (coming from WiFi networks or other devices operating on the 2.4 GHz range), you can get a **range of over 70m**.
Indoors (or with additional interference), range will be significantly reduced.
## 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.setTransmitPower(1)
```
### Parameters
* ``power`` -- a [number](/reference/types/number) between ``0`` and ``7``.
### Example
Sets the transmitter power to full power at 7.
```blocks
radio.setTransmitPower(7)
```
### See also
[receive number](/reference/radio/receive-number), [send number](/reference/radio/send-number), [on data received](/reference/radio/on-data-received)