clean your original car side mirror with alcohol or some other cleaning products. Press down HARD when the mirror is stick to the black pivot base, it is more firmly stick and will not fall off from the pivot base. 2 piece packaged, newest upgrade 360 degree rotate + sway adjustabe, maximize your view with wide angle in car. All convex spot mirrors are equipped with tiny adjustable swivel mounting bracket for easy installation. 2" HD glass curved male face frameless ultrathin slim design, equip with 3M adhesive for pressure-sensitive tape installation. IP65 waterproof, rust resistant and the glass will not haze. Suitable for interior or exterior use.