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Instruction Manual — USB-4 Multiport Adapter with 8K HDMI

This manual covers setup and features for the Satechi USB-4 Multiport Adapter with 8K HDMI (Model: ST-U4MA3M).

📄 Download User Manual — USB-4 Multiport Adapter with 8K HDMI · PDF · 1.8 MB

In the Box

USB4 Multiport Adapter, User Manual.

Specifications

Model: ST-U4MA3M
Dimensions: 75 x 145 mm
Connector: USB-C

Ports & Speeds:
1× HDMI — 8K 30Hz (or 4K 60Hz on Mac)
1× USB-C PD charging — up to 100W (~15W used for operation)
1× Gigabit Ethernet
2× USB-A 3.2 — up to 10 Gbps data
1× USB-A 2.0 — for peripherals
1× SD + Micro SD card slots
1× 3.5mm audio jack

Parts Reference

1. USB-C Cable — Built-in USB-C cable that connects the adapter to your laptop's USB-C port.
2. 8K@30Hz HDMI Video Port — HDMI output supporting up to 8K 30Hz (4K 60Hz on Mac).
3. USB-A 2.0 Port — USB-A port for low-bandwidth peripherals.
4. 2× USB-A 3.2 Ports — Two high-speed USB-A ports for data transfer up to 10 Gbps.
5. SD & Micro SD Card Slots — Dual card readers for SD and Micro SD cards.
6. USB-C PD Port (Up to 100W) — USB-C port for power delivery / laptop charging up to 100W (~15W used for operation).
7. LED Indicator — Lights up when the adapter is connected and powered.
8. Audio Jack Port — 3.5mm audio jack for headphones or speakers.
9. Ethernet Port — Gigabit Ethernet for wired network connectivity.

Setup

The USB4 Multiport Adapter is plug-and-play — no drivers or software required.

Step 1: Plug the built-in USB-C cable into a USB-C port on your laptop.
Step 2: Connect your devices to the adapter's ports.

Important Notes

USB-C PD port is for charging only: The USB-C PD port (port 6) does not support data transfer or video output. It is for laptop/device charging only.

HDMI resolution by host device: The HDMI port supports up to 8K 30Hz on compatible hosts. On Mac, maximum output is 4K 60Hz.

USB-C PD power budget: The adapter uses approximately 15W for its own operation, so effective pass-through charging is up to ~85W when using a 100W power supply.

Frequently Asked Questions

What is the maximum HDMI resolution?
The HDMI port supports up to 8K 30Hz on compatible systems. On Mac, the maximum output is 4K 60Hz.

Can I charge my laptop through this adapter?
Yes. Connect a USB-C PD charger (up to 100W) to the USB-C PD port. The adapter uses ~15W for operation, delivering up to ~85W to your laptop.

What is the difference between the USB-A 2.0 and USB-A 3.2 ports?
The USB-A 2.0 port supports basic peripherals (keyboard, mouse, etc.). The two USB-A 3.2 ports support high-speed data transfer up to 10 Gbps.

Does the Ethernet port support Gigabit?
Yes. The Ethernet port supports Gigabit speeds.

Safety Instructions

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

1. Do not expose to extreme heat or direct sunlight for extended periods.
2. Do not drop or subject the adapter to strong impacts.
3. Keep away from liquids and moisture.

Need Help?

Contact Satechi Support at support.satechi.com or email support@satechi.com.
Phone: +1 858 268 1800 | Website: www.satechi.com