The Aluminum Extreme Mount is designed to give you double the protection with the highly durable suction cup that stays securely on your window. It even stays on while driving on rough and bumpy roads! To place the mount onto your window, take the plastic seal off the suction cup and pull the lever up to release it; then put it where you want it and pull the lever down to lock it in place. You can adjust the angle of the arm by turning the levers to the position you want. When putting your Alpha or Astro Handheld onto the mount, you simply slide it onto the top piece until secure.