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AUTO LOCK: This gravity slide in phone mount has two auto-lock arm slots. These arms are adjustable to the measurment of your phone. The auto-lock arms are sturdy and will hold your phone under any sort of condition such as bumps and quick turn. Compare to manual phone mounts. This auto-lock arm save you time and give you the convienece when driving! Auto-lock arms has built in silicone rubber to protect your phone from any sort of scratches!. UPGRADED AIR VENT HOOK: This car vent phone holder mount is designed as "Hook shape" and form "Three grasp points" which can firmly hook around the a/c vent for no slippage or movement. It solving the market's common problem of falling forward and off the air vent constantly when going over bumps or turns. NOTE: THE LENGTH OF CLAMP BETWEEN 0.41-0.98IN. EASY TO USE & JUST SLIDE AND GO: Slide in your phone and your mount automatically clamps your phone in by gravity. Slide your phone up and out to remove phone from your mount! You could do all this within a second. Fast and easy!.