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# CBAdvertisementDataOverflowServiceUUIDsKey

An array of UUIDs found in the overflow area of the advertisement data.

```
let CBAdvertisementDataOverflowServiceUUIDsKey: String
```

## Discussion

The value associated with this key is an array of one or more [`CBUUID`](/documentation/CoreBluetooth/CBUUID) objects, representing [`CBService`](/documentation/CoreBluetooth/CBService) UUIDs.

Because data stored in this area results from not fitting in the main advertisement, UUIDs listed here are “best effort” and may not always be accurate. For details about the overflow area of advertisement data, see the [`startAdvertising(_:)`](/documentation/CoreBluetooth/CBPeripheralManager/startAdvertising(_:)) method in [`CBPeripheralManager`](/documentation/CoreBluetooth/CBPeripheralManager).

---

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