The light will turn on at night automatically in red color and turn to green when people sit down on the toilet.The product adopts light sensing and human motion infrared technology energy-saving and environmental friendly.It will turn off within 30-50s after you close the toilet lid automatically.Simple to install by using two adhesive strips no technicians and tools needed.Powered by two AA batteries very easy and convenient to change the batteries.size:7.5*9*2.5cmcolor:whitematerial:plasticLED qunatity:1 red and 1 greenlight color:red and greenvoltage:3Vpower source:2*AA batteries