The GC3 panel features 100 wireless zones, 100 user codes, 2GIG's patent-pending CellSled(TM) cellular radio that can be installed via a side-panel door. GC3 also has a USB port on top, for updating firmware plus dozens of new features like user bookmarks, ‘rooms’ for fast automation, and one-touch arm/disarm. The kit includes the most popular add-on products homeowners want: A PIR motion detector, 3 compact door-window sensors, and the 4-button Key Ring key fob.