While Apple may have launched a new MacBook Pro with LED touch bar a week and a half ago with Thunderbolt 3 ready USB-C connectors, a new compatibility test shows that not all devices using the standard will be able to operate with the notebook.

Accessory manufacturer Plugable recently ran a test to see which USB-C hubs and accessories, docking stations, display adapters and cables were compatible with the MacBook Pro 2016. The notebook offers between two and four Thunderbolt 3-enabled USB-C ports depending on configuration, but the site has found that some Thunderbolt 3 DisplayPort and HDMI adapters, along with some USB-C 3 port hubs, are not compatible with the device due to the type of controllers they use.