A illumination device comprises a light guide having a first end for receiving light and configured to support propagation of light along the length of the light guide. A media drive is operable to write data in the medium. Once the coupler has been aligned and attached to the hitch ball, the first removable item can be removed. The locking assembly includes a locking member and an engaging member engaging with the locking member. An upper mast is attached to the lower mast and configured to accommodate a wind turbine. An isocyanate composition containing a catalyst of the claimed composition is also described.