The AC S78 not only incorporate the S7 style of the 3-D design and multi-layered dials, its outer frame embosses the cut of a octagon frame. The AC marking frame design adds to the dimension, style and element. Features: -Stepping Motor -On/Off Self-Sweeping Inspection -Warning Light - Red/White LED -Reverse Auto Self Lighting Design -IGN ON Self Examination Function (9, 12, 3, 12, 9, 6 O'Clock) -High Precision 270° Sweep Motor Inside -Special 3D Dial Face Design