1.For circular vents: Adapts to all circular vents of all types of cars. Please check your car's ventilation system before purchasing. The mobile phone holder can be used in all of the vehicles2.Safe and stable: The retaining clip and the cell phone holder are equipped with a non-slip silicone pad to improve posture and stability and to protect the ventilation slots and cell phones.3.One-handed operation: Press the smaller opening arms and the holder opens automatically. Press the protruding force sensor button with your mobile phone and the mobile phone will be attached automatically. It can be operated with one hand. (Simply lock or unlock the phone with the touch of a finger on the phone holder.)4.Double retaining feet: The double retaining feet ensure improved stability. The spaces for the HOME button and data cable charging connection are reserved, which enables normal operation.5. [Suitable for 4-6.4 inch cell phones]: Broad Compatibility: Perfect for phones or GPS navigation between 4-6.4 inches