Features. *Environmental protecting design,uses water current as energy source , saved money for replace batteries. No need to turn on any other light at night when bathing in your bathroom when you own it. *This Temperature sensitive LED shower provides a visual indication of water temperature. When water flows down, the LED will light instantly and automatically: Showerhead colors/temperature: - GREEN; . - BLUE; 33-41 deg C - 91 - 105 deg F. - RED; 42-45 deg C - 108 - 111 deg F. - FLASHING RED; 46 deg C - 115 deg F, so you do not burn yourself. *3/4 screw diameter fitting for most of standard hose. Easy retrofit installation, just twist off your existing shower head and replace with the new one. *Water flow: approx 2.5 gallons per minute. *Material: Chrome coated ABS.