Rotatable and retractable vent hooks make this phone holder universally suitable for horizontal/vertical/diagonal types of AC vents. Compatible with 4-6.8-inch devices The triangular force design and grooved claws ensure that the phone is securely locked in place, even when braking, turning, or bumping. The ball joint swivels freely degrees to give you the best viewing angle. Easy To Use - Slide your phone onto the holder and it automatically locks your phone in place.