SDF-B9 1 LED ABS Temperature Sensor 3-color LED Faucet Light Water Glow Shower, Size: 58 x 28mm, Interface: 22mm (Silver) 1. When water flows down, the LED will light instantly and automatically. 2. The color change remind you the water''s temperature. 3. Offer you a delight & wonderful experience. 4. No batteries no wire needed. 5. Easy to install. 6. Ideal for bathroom or kitchen to make it fantastic. Color: 1. When water temperature is < 31 Degree Celsius, green color will show automatically. 2. When water temperature is between 32-43 Degree Celsius, blue color will show automatically. 3. When water temperature is between 44-50 Degree Celsius, red color will show automatically. 4. When water temperature is above 51 Degree Celsius, red color will flash immediately. Package Contents: 1 x LED Faucet Light 2 x External Thread Adapters(22mm to 20mm, 22mm to 24mm)