pxt-calliope/docs/reference/radio/set-transmit-serial-number.md

# Set Transmit Serial Number

Make the ``radio`` packet embed the board serial number with each packet of data.

```sig
radio.setTransmitSerialNumber(true);
```

### Parameters

* ``transmit`` is a [boolean](/reference/types/boolean) that represents whether the serial number needs to be transmitted.

### Example

This program makes the ``radio`` send the serial number in each packet.

```blocks
radio.setTransmitSerialNumber(true);
```

### 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
```