Rotating ball-head for easier mounting, viewing and navigatingQuakeproof designed, the two arms in the main unit can extend to a width you needEasy installation, no additional tools, it only takes a few seconds to complete itProtection, the device is embedded soft silicone pad, to protect your phone from scratch or scratches, etcEnvironmental protection material made of wear-resisting, high toughness, can be used for a long time.