The moxa box is used to apply moxibustion to large areas, such as the abdomen or lower back. Tonifies Yang, Qi, warms and eliminates cold.
There are several sizes. It has a grid in the middle where the moxa is placed. Make sure the grid is in good condition and far enough from the skin to avoid burning. Ideally it has the right height so that it can be placed on top of needles. This way you can needle, for example, CV-4 and place the moxa box on top to warm the entire lower abdomen and tonify the Yang.