Overview

The ELECOM USB Hub U3H-H042BK/E is a compact 4-port USB-A hub supporting USB 3.2 Gen1. It delivers data transfer speeds up to 5Gbps and runs on bus power, so no external power adapter is needed. The 15cm cable keeps the hub close to your laptop or desktop, reducing cable clutter. Its small size and light weight make it easy to carry, perfect for expanding USB ports on the go.

Key Features

  • 4 USB-A ports: Add four USB-A ports to your computer. Connect mice, keyboards, USB drives, and other peripherals simultaneously.
  • USB 3.2 Gen1 (5Gbps): Up to 10x faster than USB 2.0, enabling quick file transfers for large documents or media.
  • Bus-powered operation: No AC adapter required – just plug into your computer's USB port. However, high-power devices like external hard drives may not work reliably.
  • Compact and lightweight: Fits in the palm of your hand, weighing only about 30g. Ideal for travel or tight desk spaces.
  • ELECOM quality: Manufactured by a trusted Japanese brand. Sold and fulfilled by Amazon.co.jp (ASIN: B0DVGRKJV6).

Compatibility Guide

This hub works with any computer that has a USB-A port, regardless of operating system (Windows, macOS, Linux, Chrome OS). Because it is bus-powered, the available power is limited to about 2.5W (5V/0.5A). Low-power devices like USB flash drives and mice work fine, but high-power peripherals such as portable SSDs or external HDDs may not function properly. For such devices, consider a self-powered hub with an AC adapter.

Ideal Use Cases

  • Expanding laptop ports: Many ultrabooks have only two USB-A ports. This hub lets you connect both a mouse and keyboard without sacrificing a port for a USB drive.
  • Desktop front-port extension: Place the hub on your desk for easy access instead of reaching behind the tower.
  • Travel companion: Tuck it into your laptop bag for temporary expansion at cafes, meetings, or hotel rooms.

Upgrade Considerations

This hub is limited to USB 3.2 Gen1 (5Gbps). If you need faster speeds (10Gbps or 40Gbps), look for USB 3.2 Gen2 or Thunderbolt hubs. Also, be mindful of bus power limitations. If you plan to connect multiple power-hungry devices simultaneously, a self-powered hub is a better investment.

Product Disclosure (Amazon)

  • Manufacturer: エレコム
  • Brand: エレコム(ELECOM)
  • Seller: Amazon.co.jp
  • Fulfilled by: Amazon.co.jp
  • Model: U3H-H042BK/E
  • ASIN: B0DVGRKJV6
  • Note: This article covers a manufacturer-made product based on Amazon listing details.