feature: Stereo wide-angle lens can eliminate blind spots of vision Can adjust the angle according to driving 360 degrees 40MM large mirror effectively expands the field of view Install the product properly on the side of the driving position and on the rear view mirror Installation guide 1 Dry the dirt and grease on the surface with a mild detergent 2 tear off the protective film at the bottom of the mirror 3 Fix the blind spot mirror in a clean position 4 24 hours after fixing to achieve good results