Experience the luxury of whole home scenting. The Double Presidential Scent Diffuser allows you to scent with ease and efficiency with its HVAC compatibility, resourcefully covering multiple areas at a pre-selected scent concentration level. Manage when scenting occurs with its easy-to-use internal digital timer. Utilizing cold-air diffusion technology, the Double Presidential Scent Diffuser turns fragrance oil into a dry nano-mist. With this method, scent stays suspended in the air longer and has better coverage. Using no heat or water, it preserves the therapeutic properties of our fragrance oils without altering their smell.  This type of advanced atomization technology is residue free and safe for children and pets.  Key Features Pairs with one or two 500 mL oil bottles Single Bottle: Scents up to 3,000 square feet Double Bottle: Scents up to  6,000 square feet Built-in fan for consistent coverage HVAC connection capabilities Waterless, heatless technology No residue Safe for children and pets Programmable weekly timer Dimensions: 10 ¼ x 6 ½ x7 ½ (inches)