Use the mechanical lever on the suction cup to fix the holder to any flat glass surface. These work great on a windshield to hold a smartphone. They also work great on a glass table or other smooth surface. The magnet is strong and will easily hold a small tablet so you can operate hands free and swivel the tablet in any direction to watch video. Unit comes with a small metal plate that adheres to back of phone or tablet or on back of phone between phone and case.