The RAP-105-6224-GA16U consists of a patented twist lock suction cup base, 6" flex arm and custom high strength composite cradle for the Garmin eTrex. Once the suction base is securely mounted, you can move the cradle to your optimum viewing position with a simple bend of the arm. The suction cup base is designed to have an extra strong hold on any smooth non-porous surface. For best results mount the suction cup to glass or non-porous plastic surfaces.