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

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# Send String
Sends a string to other micro:bits in the area connected by radio. The
maximum string length is 19 characters.
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```sig
radio.sendString("Hello!")
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```
### Parameters
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* `msg` is a [string](/reference/types/string) to send by radio.
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### Example: Two-way radio
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If you load this program onto two or more micro:bits, you can send a
code word from one of them to the others by pressing button `A`. The
other micro:bits will receive the code word and then show it.
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```blocks
input.onButtonPressed(Button.A, () => {
radio.sendString("Codeword: TRIMARAN")
basic.showString("SENT");
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})
radio.onDataPacketReceived(({ receivedString }) => {
basic.showString(receivedString);
});
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```
### ~hint
A radio that can both transmit and receive is called a _transceiver_.
### ~
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### See also
[on data packet received](/reference/radio/on-data-packet-received)
```package
radio
```