Until now, security features on laptop cradles have been difficult to use, or they simply get in the way of productivity. RAM has turned all that into a memory with the Secure-N-Motion security package. You'll have peace of mind knowing your laptop will stay put, even under the most adverse conditions. Using a keyed locking knob and slim restraining arms, operation is simple, easy, and extremely secure. Includes 4 front and rear retaining arms and 1 locking system for laptop tray.