Alcyon Enclosed Step Spot MR16 track head features a wireless stem profile with infinite horizontal rotation and 0-90 degree vertical adjustment. Made of die-cast aluminum in Matte White, Matte Black or Metallic Aluminum finish. Includes 12 volt Class 2 compact electronic transformer inside molded polycarbonate housing and glass shield for use with unshielded lamps. One 50 watt, 12 volt GU5.3 MR16 halogen lamp is required, but not included. UL listed. 2.75 inch diameter x 2.75 inch depth x 4.75 inch length. Compatible with Lytespan Basic 1-circuit, Advent 1 or 2 circuit, and Radius 1-circuit track systems.