That gets the important search terms into the title.

For Condition, choose New – Open Box if gives you that option.

For the description, I'd keep it straightforward:

NEW – OPEN BOX – NEVER USED

OFFNOVA DTF CISS Continuous Ink Supply System with automatic white ink circulation/stirring.

Designed for DTF conversion of compatible 6-channel inkjet printers, including Epson ET-8550, L805 and XP-15000.

Features automatic white ink stirring, six 250ml ink tanks, built-in 2600mAh battery, status indicators and Type-C charging.

IMPORTANT: NO INK IS INCLUDED.

This listing is for the CISS circulation system only and the included system components shown in the photos. You will need to supply your own DTF ink.

Item was received directly from the manufacturer for evaluation but was never put into service. It is being sold because I do not personally do DTF printer conversions.

Please review all photos carefully for exactly what is included.