Features of the different Kangaroo adjustable height desks. Below is a summary of the key features and uses of the different Kangaroo models. They are listed in the same order as Ergo Desktop's product page so you can follow them more easily. Kangaroo Junior. This is one of the low cost options and includes the following: Small keyboard and mouse work surface measuring 24 inches by 18 inches. Upper shelf for use with either a laptop or a monitor on a stand weighing up to 12lbs. Upper shelf sits 3.5 inches above the work surface.