This box looks like a small box, with gear imagery on each side. Once attuned each of these faces can rotate and with a certain combination open a demi plane called The Shop.

 The Shop - This configuration teleports the attuned creature and other creatures that the attuned creature designates to a demi plane, specifically a square room 20ft. x  20ft with a 15 feet ceiling. This room starts completely empty, and must be filled by the attuned artificer. Time is connected to the prime material plane so that time is completely the same. The only thing on one wall is a door which leads to the same space where the cube is in the real world. 

Notes: Artificer Level 5 or higher