Clean the side mirror of the car with a cloth and a small amount of alcohol or other cleaning supplies, then attach the blind spot mirror to the mounting bracket and install it on the side rear-view mirror. Large Wide Angle, High Definition, 360 Degree adjustabe HD glass convex wide angle rear view. HD glass curved frameless ultrathin slim design, 2piece packaged,The longest edge: 2.52",Long side:1.88". Blind spot mirror can increase vision, reduce blind spots, and ensure safe driving during driving and lane change. 2 "hd glass curved surface without bezel ultra-thin design, Fashion, elegance.