This series of clocks is from the mind of one the worlds most famous and iconic graphic designers, Milton Glaser. Reductous is one of the most simplified versions of a clock face ever designed. Sprocket is an amusing decorative little fellow. Presto is not merely a clock, it is a visual accompaniment to the passage of time. To set time, gently press button on back. Includes 1 CR2032 button cell battery.