The tree kits have all the electronics assembled, mounted, wired, etc. It is called a kit because you need to hang the ribbons up to make the ribbon tree, or if you like, you can make a horizontal matrix, etc... The Pixie16 controller based kits are less expensive. They will only run on an Light-O-Rama network. If you do not use Light-O-Rama to run your show then you will need to use the PixCon16 controller based kits. ccsustritrki 12 Ribbon Tree - Pixie16 Controller $999.95 16 Ribbon Tree - Pixie16 Controller $1,199.95 16 Ribbon Tree - Pixcon16 Controller $1,319.95 12 Ribbon Tree - Pixcon16 Controller $1,119.95