This little device fits on most teethProvides you with gorgeous bathroom and wonderful experiencerequires no batteries or external power supplyTemperature-sensitive and automatic controlled LED Faucet If the water flows, LED lights will light up immediatelyThis LED Faucet Water Tap requires no battery or external power supply and is controlled temperature sensitive and automatically.It is a very practical and stylish LED faucet apparatus for your kitchen.LED color changes automatically when the water temperature changesThe colors of the LED lights prompted the temperature of waterLED Emitting Color: Green, Blue and RedWater temperature at below 31deg C: Green LED lightWater temperature at between 32 to 43 C: Blue LED lightWater temperature at between 44 to 50 C: Red LED lightWater temperature at about 51 C: LED lights flash red to prevent scaldingShower head Diameter: Approx 1.1 inches / 2.8 cmInner Diameter: Approx 0.59 inches / 1.5 cmExternal thread diameter: Approx 0.87 inches / 2.2 cmTotal length: Approx 1.97 inches / 5cmLED Quantity: 1 LEDMaterial: ABSColor: silverPackage Included1 x LED FaucetNote:Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3 cm.