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This User Manual covers all features, setup, specifications, and troubleshooting for the Satechi USB4 C-to-C Cable (ST-U4C80M / ST-U4C25M).

In the Box

USB4™ C-to-C Cable, User Manual.

Specifications

Model: ST-U4C80M / ST-U4C25M
Connector Type: USB-C to USB-C
Data Transfer Speed: 40Gbps
Max Power Delivery: Up to 100W
Video Output: Up to 8K/30Hz
Compatibility: Compatible with Thunderbolt™ 4. Downwards compatible with Thunderbolt™ 3, USB 3.2, USB 3.1, USB 3.0, and USB 2.0.
Cable Body: Durable braided

Parts Reference

The cable’s components are numbered below to match the diagram.

Parts labeled diagram of the USB4 C-to-C Cable with 2 labeled components.

1. USB4 Connectors (40Gbps / 100W / 8K/30Hz) — USB-C connector at each end of the cable. One end connects to your host device (laptop, computer, or USB-C power source); the other connects to your peripheral, display, or device being charged.
2. Durable Braided Cable — The premium braided cable body, designed for durability and flexibility.

Setup

Step 1: Connect one end of the cable to your device (laptop, computer, or USB-C PD power adapter).
Step 2: Connect the other end to the peripheral, monitor, or device you want to power, charge, or transfer data to.
Step 3: If connecting to an external display, ensure your monitor's input is set to the correct HDMI or DisplayPort/Alt Mode source.

Important Notes

Video output is limited to 8K/30Hz.

This cable supports up to 100W USB Power Delivery. Both the power adapter and the device must support the required wattage.

Compatible with Thunderbolt™ 4, and downwards compatible with Thunderbolt™ 3, USB 3.2, USB 3.1, USB 3.0, and USB 2.0.

Safety Instructions

Warning: Fire, electric shock, or damage could occur if the following instructions are not obeyed.

1. Do not bend, kink, or pinch the cable sharply.
2. Keep away from liquids and moisture.
3. Do not use if the cable or connectors are damaged or frayed.
4. Do not force connectors — ensure correct alignment before inserting.

Certifications

FCC, CE, WEEE, CAN ICES-3(B)/NMB-3(B)