The Sonnet Thunderbolt Dual 4K HDMI 2.1 Adapter connects two HDMI displays to a single compatible Thunderbolt or USB4 host connection.
On macOS it supports two displays up to 4K 60Hz, while compatible Windows systems can support two 4K displays up to 120Hz or a single 8K 60Hz display.
Original price was: £ 97.00.£ 88.95Current price is: £ 88.95. | £ 106.74 inc VAT
In Stock
The Sonnet Thunderbolt Dual 4K HDMI 2.1 Adapter (TB3-DHDMI-21) provides two HDMI display outputs from one compatible 40Gbps Thunderbolt connection.
Two HDMI 2.1 ports support high-resolution external displays. Sonnet specifies two 4K 60Hz displays under macOS and, on compatible Windows systems, two 4K displays up to 120Hz or one 8K 60Hz display.
The adapter uses a 40Gbps Thunderbolt interface and is supplied with a captive 20cm Thunderbolt cable. It is not designed for USB-C-only host ports.
The adapter supports EDID 1.4 and HDCP 2.2 and is suitable for general desktop, productivity, creative and video applications on compatible systems.
No external power adapter is required, helping keep dual-display setups tidy and portable.
| Product | Sonnet Thunderbolt Dual 4K HDMI 2.1 Adapter |
| Sonnet Part Number | TB3-DHDMI-21 |
| Form Factor | Display adapter |
| Host Interface | 40Gbps Thunderbolt |
| Video Outputs | 2 × HDMI |
| HDMI Standard | HDMI 2.1 |
| HDCP | HDCP 2.2 |
| macOS Maximum | 2 × 4K 60Hz |
| Windows Maximum | 2 × 4K 120Hz or 1 × 8K 60Hz |
| Host Cable | Captive 20cm Thunderbolt |
| Dimensions | 60 × 113 × 15mm |
| Power | Bus powered |
| Warranty | 2 years |
Generally, next working day delivery services (UK Mainland) are available on standard Sonnet Technology Delivery orders placed before 2 pm (subject to stock availability).
Non-timed deliveries should be delivered between 9 am and 6 pm.
Orders placed after 2 pm on Fridays and weekends will be processed as normal the following Monday.
Orders placed on Bank Holidays will be processed the next working day.
If urgent, please call one of our helpful account managers so they may double check everything for you, enabling you to place your order with confidence.
Please note: these product details are for guide purposes only, and may contain errors.
We always recommend double-checking the product specs and features on the the manufacturer website, or contact us if unsure before ordering.
