JC-A399G
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Q: What’s the maximum video resolution and refresh rate supported by the HDMI port?
A: The JCA399G supports up to 4K (3840 × 2160) at 144 Hz via HDMI when connected to a USB-C port that supports DisplayPort Alternate Mode 1.4 with DSC (Display Stream Compression).
Q: What USB ports are included and what data transfer speeds are they?
A: The adapter includes both a USB Type‑A and a USB Type‑C (Gen 2) port, each supporting 10 Gbps transfer speeds for high-speed data performance.
Q: Can I charge my laptop or device while using the adapter?
A: Yes. The adapter supports USB-C Power Delivery 3.0 with up to 100 W passthrough charging, allowing you to power your laptop or other devices while using HDMI and USB ports.
Q: Does this adapter require any drivers or software to work?
A: No. The JCA399G is plug-and-play for most modern systems and does not require any driver installation for video, USB data, or power delivery functionality.
Q: Which devices is this adapter compatible with?
A: It is compatible with USB-C devices that support DisplayPort Alternate Mode and USB Power Delivery, including MacBooks, Windows laptops, Chromebooks, tablets, and other USB-C hosts. Full 4K 144Hz performance requires a system with DisplayPort 1.4 + DSC support.
Unlock the full potential of your laptop with the JCA399G USB-C to USB 10Gbps & HDMI 4K144Hz Adapter. This versatile 4-in-1 hub combines high-speed data transfer, stunning 4K UHD video output, and reliable power delivery in a sleek, compact design. Connect your laptop or tablet to an external 4K monitor at an ultra-smooth 144Hz refresh rate, transfer large files rapidly through USB 3.2 Gen 2 ports, and keep your device powered with up to 100W USB-C Power Delivery — all at the same time.
Designed for professionals, gamers, and creatives, the JCA399G is compatible with a wide range of USB-C laptops and tablets that support DisplayPort Alt Mode and USB Power Delivery. Whether you're presenting, streaming, or multitasking, this adapter ensures you stay connected without compromising performance or portability.
Portable 4-in-1 Design
Combines 4K144 HDMI™, one USB™ Type-A 10 Gbps, one USB-C® 10 Gbps, and PD pass-through charging. 4 ports working simultaneously.
Stunning HDMI™ 4K144Hz Display
Elevate your gaming and visual experience with seamless support for high resolution and refresh rate.
| Product Name | USB-C® to USB™ 10Gbps & HDMI™ 4K144Hz Adapter |
| Model Number | JCA399G |
| Host Connector | 1 × USB-C® Male |
| Video Output | 1 × HDMI™ Female (4K @ 144Hz) |
| Other Ports | 1 × USB-A 3.2 Gen 2 (10Gbps) 1 × USB-C® Gen 2 (10Gbps) 1 × USB-C® PD 3.0 (up to 100W) |
| Displays Supported | 1 |
| Max Display Resolution | 3840 × 2160 @ 144Hz 2560 × 1440 @ 144Hz 1920 × 1080 @ 144Hz |
| Max Display Refresh Rate | 144Hz |
| Max Data Transfer Rate | 10Gbps (USB-A & USB-C) |
| Audio Supported | Yes |
| Power Delivery | Up to 100W via USB-C® PD 3.0 |
| PD Input | Up to 20V / 5A |
| PD Output | Up to 20V / 4.25A |
| Power Consumption | ≤ 350mA |
| Power Source | Bus-powered or self-powered |
| Color | Space Grey |
| Enclosure Type | Aluminum |
| Cable Length | 7.87 in. (20 cm) |
| Product Dimensions | 3 × 1.8 × 0.43 in. (75 × 45 × 11 mm) |
| Product Weight | 49.5 g (1.75 oz) |
| Operating Temperature | 30°F to 106°F (−1°C to 41°C) |
| Storage Temperature | 0°F to 155°F (−17°C to 68°C) |
