This rear-view mirror was rated The Best by the Hammacher Schlemmer institute due to its superior range of view, lack of distortion, and ease of use. It had the widest field of view at 180°, enabling panelists to see through rear side windows and eliminate blind spots better than any other model. The Best mirror also provided a clear reflection with no distortion, while other units either made panelists feel dizzy or caused items in the reflection to appear warped. Also ranked as one the of the easiest units to use, it has spring loaded clamps that secure it over a vehicle’s existing mirror without requiring tools or adhesive. Fits over most standard rear-view mirrors.