Expandable and Durable Base - Easy tightening & loosening mechanism, this car phone mount will securely lock in your cup holder and you just need to rotate the cone shaped part to adjust the base size. Suitable for most automobiles, trucks and other vehicles with cupholder size between 2.56" and 3.94" (6.5~10cm) in diameter. NOTE: Please carefully compare the size of your car cup holder before purchase, ensure that this product can be placed in the car cup holder. undefined Simple to install - Compatible with almost all Mobile Phones. The fully 360-degree rotation holder allows you to position your phone or GPS device horizontally, vertically, or tilt in any direction by cooperating with the swivel ball head, providing you with the perfect angle to view your devices at a quick glance. undefined 【Wide Compatibility】Securely hold your smartphone or GPS on an air vent in your transport. The holder ensures safe driving whether you are talking, navigating, listening to music or charging.undefined