D4 Plus -9 GPM disinfection, TrojanUVMax controller with water-resistant case, LED display showing lamp replacement reminder, indicator lights on the controller show the status of each system component, lamp timer reset button and mute button to silence audio alarm. Stainless steel chamber with safety cap and special lamp plug, 3/4" MNPT connections, UV intensity monitor with diagnostic test, 100-240V./50-60Hz. universal power input, high-output UV lamp.