The exterior material used in the LEVEL BOX PRO adopted the aluminum extrusion method to find the appropriate weight and structure fit for creating the sound quality of the grave baritone tone. After extrusion, the exterior process was added to express a metal edge feel, different from other company products. The company’s first 20W METAL BODY BT stereo speaker enables 2SET Dual mode, a free set-up of a space for music appreciation.