---
title: rssi
framework: corebluetooth
role: symbol
role_heading: Instance Property
path: corebluetooth/cbperipheral/rssi
---

# rssi

The Received Signal Strength Indicator (RSSI), in decibels, of the peripheral.

## Declaration

```swift
var rssi: NSNumber? { get }
```

## Discussion

Discussion Returns a number, in decibels, that indicates the RSSI of the peripheral while connected to the central manager. You can use a connected peripheral’s RSSI property to determine the peripheral’s proximity. The default value of this property is nil; the first successful call to readRSSI() sets its value.

## See Also

### Accessing a Peripheral’s Signal Strength

- [readRSSI()](corebluetooth/cbperipheral/readrssi().md)