Here are the details for a USB 3.0 4-port hub with a cable length of 30cm:

**Features:**
- Adds four additional USB 3.0 ports to your computer or laptop.
- Supports SuperSpeed data transfer rates up to 5Gbps.
- Backward compatible with USB 2.0 and USB 1.1 devices.
- Plug-and-play functionality; no additional drivers required.
- Compact and portable design for easy transportation.
- LED indicator to show power and activity status.
- Over-current protection to safeguard connected devices.

**Specifications:**
- Ports: 4 x USB 3.0 ports
- Transfer Rate: Up to 5Gbps (USB 3.0)
- Cable Length: 30cm
- Compatibility: Windows, macOS, Linux
- Power: Bus-powered (no external power adapter required)
- Material: Durable ABS plastic
- Dimensions: Compact and portable design

This USB 3.0 4-port hub offers convenient expansion of USB connectivity with high-speed data transfer rates and a compact form factor suitable for various devices and operating systems.