Optimized design medium size?? light weight of Amotus car phone holder ensures no burden to your car air vent</br>Upgraded release button for simple operation - press button on back of unit to slide open the arms to pick-and-place the mobile phones and GPS</br>Cozy touch the soft rubber layer protects your device from scratching</br>Broad compatibility with stretchable clamp that is able to hold devices in sizes from 2-3.7 inch wide</br>3 year warranty Amot