No installation required. Compact water purifier that attaches to the tip of your faucet. Includes a replacement filter and features water quality improvement. - Model: Faucet Water Purifier - Included: Replacement filter, installation parts - Color: White - Function: Water quality improvement - Size: Compact design Purchased from the official website 1.5 years ago. Selling because it's no longer needed. Rubber gasket has yellowing. *See photos.* No problem with use. Will ship in a cardboard box. Thank you for looking.