1- Ensure your faucet aerator is the standard size, 22-24mm in diameter. 2- If your faucet hs internal threads, attach the included adapter to your LED Faucet Attachment and then attach to your faucet. 3- If your faucet has external threads, attach the LED Faucet Attachment directly to your faucet. 4- Turn on your faucet. The water pressure from your sink will power the LED light directly. 5- The LED lights will cycle through all 7 colors slowly while the faucet in on. 6- To turn off the LED Faucet Attachment, simply turn off the water.