Twist-Lock Enhanced Vacuum Suction Up To 98LBS Super Strong Hold This vacuum magnetic phone holder features a suction cup phone holder with a reinforced twist-lock mechanism, delivering an ultra-secure grip with an impressive 90LBS suction force. Engineered for durability, this suction phone holder stays firmly in place even on bumpy roads. Designed as a suction phone mount for windshields and other smooth surfaces, it ensures a reliable hold. For dashboard mounting, an adhesive disc is required. This makes it the ultimate magnetic suction phone mount for your car. IMPORTANT TIPS Must use the included adhesive pad on textured surfaces such as car dashboard, wood grain, leather, or brushed plastic to ensure a secure mount. Do not mount on uneven or unstable areas such as curved dashboards, fabric, or bumpy surfaces. Must use the included adhesive magnetic ring for non-magnetic phones, thick cases, or larger/heavier devices. How to check if a surface needs the pad: