This is a complete system to mount the eTrex Color GPS unit at any angle to most surfaces, it won't slip and it disconnects quickly.  This kit includes the RAM eTrex Color GPS Cradle (NAMT-1-7308),RAM Twist and Lock Suction Mount Base with Ball (NAMT-1-7305), RAM Standard Arm (NAMT-1-7303), and  Ram Diamond Adapter Plate (NAMT-1-7302).  This kit is priced below the total sum of buying the components separately.