Tera LED 7 Colors Changing Water Stream Control Shower Head Sprinkler for Bathroom Home Hotel No need of extra power supply or battery, the water stream can provide power stream for LED color changing. Connection Standard: G1/2. External thread diameter: 2cm/0.79". Dimension: approx.113x90mm/4.4x3.5". It fits for installing in the bathroom and allows for using even turning off the light in the bathroom. It also can be sent as a gift for birthday or Christmas.