---
title: "peripheralData(withMeasuredPower:)"
framework: corelocation
role: symbol
role_heading: Instance Method
path: "corelocation/clbeaconregion/peripheraldata(withmeasuredpower:)"
---

# peripheralData(withMeasuredPower:)

Retrieves data that you can use to advertise the current device as a beacon.

## Declaration

```swift
func peripheralData(withMeasuredPower measuredPower: NSNumber?) -> NSMutableDictionary
```

## Parameters

- `measuredPower`: The received signal strength indicator (RSSI) value, measured in decibels, for the device. This value represents the measured strength of the beacon from one meter away that Core Location uses during ranging. Specify nil to use the default value for the device.

## Mentioned in

Turning an iOS device into an iBeacon device

## Return Value

Return Value A dictionary of data that you can use in conjunction with a CBPeripheralManager to advertise the current device as a beacon.

## Discussion

Discussion The returned dictionary encodes the beacon’s identifying information, along with other information needed to advertise the beacon. You don’t need to access the dictionary contents directly. Pass the dictionary to the startAdvertising(_:) method of a CBPeripheralManager to begin advertising the beacon.