---
title: wBytesPerInterval
framework: IOKit
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 18.4+, macOS 10.8+]
path: iokit/iousbendpointproperties/1426234-wbytesperinterval
---

# wBytesPerInterval

For SuperSpeed interrupt and isoc endpoints, this is the wBytesPerInterval from the SuperSpeed Endpoint Companion Descriptor. For High Speed High Bandwidth isoc endpoints, this will be equal to wMaxPacketSize * (bMult+1).

## Declaration

```occ
UInt16 wBytesPerInterval;
```