Upgrade Metal Hook: The material of the car phone holder hook is sturdy metal to ensure that the phone holder hook clip will not break.The outer surface is wrapped with a thick layer of silicone to perfectly protect the ventilation slots.NOTE: The length of the clip can be adjusted by rotating the adjustment knob.Excellent Compatibility: The improved air vent hook is compatible with 99% of horizontal and vertical air vents.The one-button release car holder for mobile phone can be securely hooked onto the air conditioning vents without slipping or moving.Note: Round vents are not compatible.Never fall off: The universal car phone holder is made of innovative hollow silicone rubber, which is stronger than other ordinary silicone rubber and tightly surrounds the phone to prevent it from slipping out.Stability and durability: The clamp arm and feet of the car phone holder have a thick silicone layer.It will never fall out like other products no matter how bumpy the road is.360 Adjustable: The car phone holder smartphone has a 360 rotation, which can change horizontal and vertical angles as you like, so you can enjoy the best driving posture.