silicone suction cup phone case mounting double-sided, hands-free strong grip, non-slip phone accessories for selfies and videos, silicone sticky phone grip for higher suction power for mobile phones Note: You can attach the suction cup phone mount to a smooth surface such as a mirror or glass. Before releasing your hand, make sure the phone is firmly adheres. The suction power of the suction cup phone mount will gradually weaken over time. It is recommended to use it for a maximum of half an hour at a time to prevent the phone from falling.