The back side of the ring treasure is screwed, and if you remove it, there is a supply port. If you loosen the other screw, there is a small outlet.
You don't have to completely remove the small screws to make the incense come out, so you don't have to worry about losing the screws.
The reverse side is engraved with the Ruyi Jewel, and the thickness is engraved with the dragon of Aun.