• GRAVITY LINKAGE DESIGH, LESS THAN 1 SECOND TO LOCK AND RELEASE,EASY USE CAR MOBILE HOLDER We design according to gravity linkage theory,so you no need to push any side button or back button,once you put your smartphone in the car phone holder, its gravity will press the bottom arm down, at the same time, another two upper arms will hold the smartphone together with the bottom arm,form a triangle struction, hold the smartphone firmly.