The CM251 (Model Number: 60559) 5-in-1 USB-C Hub promises to expand the connectivity of your MacBook, adding a 4K HDMI port, a USB-C Gen 2 port, and three additional USB 3.0 ports. But does it deliver on its promises? After extensive testing, I’m here to share my honest opinion.

This compact hub boasts a sleek silver aluminum design, perfect for complementing the aesthetics of newer MacBooks. Its key features include:

• 4K HDMI Output: Supports up to 4K@30Hz resolution.
• USB-C Gen 2 Port: Offers data transfer speeds up to 10Gbps and supports 100W Power Delivery.
• Three USB 3.0 Ports: Provides additional connectivity for peripherals, with data transfer speeds of up to 5Gbps.
• Compact and Portable Design: Easily slips into a bag for on-the-go use.

During my testing, the hub performed admirably. The 4K HDMI output provided a crisp and clear image on my external monitor, with no noticeable lag. Data transfer speeds on the USB 3.0 ports were consistently fast, easily handling large files. The USB-C Gen 2 port also performed as expected, delivering high-speed data transfer and supporting 100W Power Delivery for charging my MacBook. Heat dissipation was surprisingly good, even during extended use. However, I did notice a slight delay in recognizing certain devices upon initial connection – this would resolve itself after a few seconds.

Pros:

• Sleek, compact design.
• Excellent 4K HDMI output.
• Fast data transfer speeds on all ports.
• Good heat dissipation.
• Supports 100W Power Delivery.

Cons:

• Minor initial connection delays with some devices.
• The 4K HDMI output only goes up to 30Hz refresh rate, which can be limiting for some users.

Overall, the CM251 (60559) 5-in-1 USB-C Hub is a solid choice for expanding the connectivity of your MacBook. Its performance is reliable, and the compact design is perfect for portability. While there are minor quirks with initial device recognition and the limited 30Hz refresh rate for the 4K HDMI output, these are relatively minor issues compared to the overall functionality. I would recommend this hub to anyone looking for a convenient and effective solution to increase the connectivity of their MacBook.