Features of innovative iLift Flexible Arm: 1. Compatible with all models: * 20, 23 and 24-inch Cinema Displays select 7517-1000 * 17 & 20-inch iMac G5 select 7517-1000 * 30-inch Cinema Displays select 7517-1500. 2. Monitor floats weightlessly; height, pivot and tilt may be adjusted with one hand. 3. Monitor may be extended up to 27 inches, arm collapses to about 3 inches. 4. 200 degrees of monitor tilt.