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# Bluetooth Set Transmit Power
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## ~hint
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For another device like a smartphone to use any of the Bluetooth "services" which the @boardname @ has, it must first be [paired with the @boardname@ ](/reference/bluetooth/bluetooth-pairing ). Once paired, the other device may connect to the @boardname @ and exchange data relating to many of the @boardname @'s features.
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## ~
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Change the output power level of the transmitter to the given value.
```sig
bluetooth.setTransmitPower(7);
```
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## Parameters
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* `power` : a [number ](/types/number ) in the range ``0..7``, where ``0`` is the lowest power and ``7`` is the highest.
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## See also
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[About Bluetooth ](/reference/bluetooth/about-bluetooth ), [@boardname@ Bluetooth profile overview ](http://lancaster-university.github.io/microbit-docs/ble/profile/ ), [@boardname@ Bluetooth profile reference ](http://lancaster-university.github.io/microbit-docs/resources/bluetooth/microbit-profile-V1.9-Level-2.pdf ), [Bluetooth on @boardname@ resources ](http://bluetooth-mdw.blogspot.co.uk/p/bbc-microbit.html ), [Bluetooth SIG ](https://www.bluetooth.com )
```package
bluetooth
```
