Forehead Viewfinder Adjustable Frontal Mirror Reflector Ear Nose Throat Checking Condition: Item Type: Forehead Viewfinder Material: Stainless Steel Use of a forward-looking lens and glasses with light: Before use, adjust the tightness of the double ball head, so that the rear view mirror can rotates flexibly in any position, but also can be used for sliding loose degree; Adjust the number of bands to fit the size of the head circumference, the front mirror for the head, double straightening spherical joint, head up display (HUD) mirror inspection hole, left view or right view, far and near, medium. Light Source: Mirror on the same side, subject slightly above the ear. Frontal Mirror Size: Approx. 8.2 x 8.2cm / 3.2 x 3.2in