Never fall The hook can lock the ventilation blade and will not fall and loosen. Length of steel hook: 1.5 inches, easier to install and install more types of automobile vents. High quality material, no odor. Scalable holderWhen the bracket is not used, the bracket will shrink to avoid blocking the air flow. 360 rotation adjustable The mobile phone bracket arm can be adjusted 360 , and the mobile phone can be adjusted to the best position and angle of view. Perfect mechanical designThis mobile phone holder will automatically adjust its status according to the thickness and width of your mobile phone. You only need to put the mobile phone into the holder. No more operations are needed. The holder will automatically fix the mobile phone. Easy to place and take. ApplicabilityThis Phone Holder is applicable to all smart phones of 4.7inch - 7inch.This Phone Holder cannot accommodate phone cases with a thickness exceeding 15mm (a typical phone case has a thickness of 10-13mm). Note: This phone holder cannot place the phone horizontally (it can only be placed vertically because it relies on gravity to hold the phone tightly).