DreamSpa 1489 AquaFan 12 inch All-Chrome Rainfall Shower-Head with Color-Changing LED/LCD Temperature Display, 12" Powered by running water; no batteries needed Built-in water temperature sensor Large lighted LED/LCD display screen indicates water temperature LCD display changes color with water temperature: BLUE - Cool under 95F (35C), GREEN - Warm 95-108F (35-42C), RED - Hot 109-122F (43-50C), FLASHING RED - Warning Hot over 122F (50C) 123 Rub-Clean Jets for drenching High-Power rainfall shower experience Elegant 12-inch curved fan design for perfect shoulder-to-shoulder flow coverage Premium All-Chrome finish Tools-free Installation. Connects in minutes to anystandardoverheadshowerarm, notoolsrequired