The twist-and-lock suction cup mounts securely on most textured surface car dashboards or curved surfaces where other mounts fail to hold Extensible to accommodate car dashboards of various lengths Residue free adhesive suction cup， built to withstand high temperatures， mount stability and suction strength will not be affected within -4 DegreeF (-20 DegreeC) to 176 DegreeF (80 DegreeC) Adjustable joint to suit various viewing angles Special silicon gel suction cup holds twice as strong and won't leave residue Keep your phone in one fixed place while you drive. Will adhere and stay on most flat dash boards. The DMOUNT has 4 degrees of adjustable freedom so you can have the perfect view of your phone while keeping your eyes on the road. The rotatable grip expands to accommodate even the largest smart phones on the market.