This small (4.93 inches x 1.56 x 1.81) device detects 150 nuances of color and distinguishes sources, intensities and natural from artificial light. It speaks clearly at 3 volumes and has an earphone jack. Hold down the two buttons together to increase/decrease the volume. Uses 2 AAA batteries (not included), and is designed to accommodate a cord. (Cord is not included). Product includes a protective pouch.