Rosco's Indexing Rotators are Double and Single Gobo Rotators which allow you to stop and start the gobo's rotation precisely, whenever and wherever you want. This is particularly useful for repetitive effects, such as the hands of a gobo clock, or for architectural effects, such as a shop display window. Rosco's Indexing Rotators are controlled through DMX512 and the DMX addressing facility is built into the unit. You control both the speed and direction of the rotation as well as the indexing position (up to 180 degrees available) and the amount of time the gobo stays in that position. A Power Supply Unit is necessary to get 24v DC to the Indexer(s) and you can daisy chain multiple units from one Power Supply Unit. Rosco's Double and Single Indexers are compatible with many common PSU's already available including: Wybron-Forerunner PSU; Rainbow-Mini, Maxi, and Micro PSU's; Christie Lites-Color Q PSU; AC Lighting-Chroma Q PSU. Rosco also offers a line of Power Supply Units which are specifically designed for optimal compatibility for both Indexers and I-Cue units.