The SX4 Scenic Projection Changer with Loop Tray for Source Four from GAM is part of a system that offers a choice of four trays that snap into an ETC Source Four ellipsoidal allowing it to project patterns. This version employs a Loop Tray that allows the projector to display continuous moving effects such as clouds, rain, snow, fire, water ripples, and waterfalls. There are more than 35 off-the-shelf designs to choose from that mount in the Loop Tray to create a visually stunning FX/loop effect. Easily control the Loop Tray's speed and direction via a built-in switch. You can plug the 120V tray into any dimmer. The Loop Tray provides easy cueing from your light board. For basic use, you can simply plug it into mains power and set your speed and direction; no light control board is required.