pxt-calliope/docs/reference/radio/set-transmit-power.md
2016-10-24 16:30:21 -07:00

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# Set Transmit Power
Make the ``radio`` signal of the micro:bit stronger or weaker.
It can be as weak as `0` and as strong as `7`.
The scientific name for the strength of the ``radio`` signal is
**dBm**, or **decibel-milliwatts**. A signal strength of `0`
can be measured as -30 dBm, and a strength of `7` can be
measured as +4 dBm.
```sig
radio.setTransmitPower(7);
```
### Range
If your micro:bit is sending with a strength of `7`, and you are in
an open area without many other computers around, the micro:bit signal
can reach as far as 70 meters (about 230 feet).
### Parameters
* ``power`` is a [number](/reference/types/number) between ``0`` and ``7`` that
means how strong the signal is.
### Simulator
This function only works on the micro:bit, not in browsers.
### Example
This program makes the ``radio`` send at full strength.
```blocks
radio.setTransmitPower(7)
```
### See also
[on data packet received](/reference/radio/on-data-packet-received),
[send number](/reference/radio/send-number),
[send value](/reference/radio/send-value),
[send string](/reference/radio/send-string)
```package
radio
```