The YOYO can be used both as handheld mirror and mounted to the base. By use of a strong magnet, the grip snaps safely into place but can also be swivelled to the appropriate angle in the base. An LED ring consisting of 64 lamp beads provides full and clear illumination which appears soft for protection of the eyes. With just one intuitively operable button, whiteness and colour temperature are measured. A 2,000 mAh lithium battery supplies power for up to one week.