Do not remove the adsorption film on the back of the blind spot mirror before installation. For results, watch the installation video first, as vacuumsuction mounting is different from standard tape installs. Installation is quick and tool: Hold the mirror with the suction cups, and loosen the frame counterclockwise. Wipe the mirror surface and the suction cups, then tighten by rotating the frame clockwise. Press the mirror to adjust the angle until you have a clear view of the blind spot. Strong adhesion: vacuum suction cups provide secure attachment without sticky residue or damage to your current rearview mirror. No blind spot: convex design expands the field of view for the blind spot; 360degree adjustability allows you to tailor the angle as you change lanes, merge, or back into a space. : made of HD glass with an ABS housing; a clean mirror finish remains clear in rain and wet conditions; waterproof design for reliable visibility. Compatibility and size: fits most standard car side mirrors; compact, unobtrusive addition that blends with your existing mirror. Use scenarios: ideal for highway merging and lane changes on busy roads, parallel parking in tight spaces, and backing into a garage or curb in rainy weather.