Automatic Freshness Glade Sense & Spray Starter Pack, Clean Linen is an automatic freshener that detects when someone passes by, instantly releasing a burst of fragrance into the air. After spray, the freshener will not spray again until 20 minutes, thereby allowing for maximum scent saving ability and constant room freshness. Effortlessly transform your home with your favorite fragrance. Detects when someone passes by and instantly releases a burst of fragrance Locks for 20 minutes after spray to conserve refill Press the Boost Button for an extra burst of freshness when locked anytime Refill and 2 AA batteries included Refill lasts up to 30 days Just For You: Small or large rooms A Closer Look: Glade Sense & Spray Starter Pack, Clean Linen has motion sensors to save refill and give constant freshness. You Won"t Find: Harmful chemicals Get Started: Lift front cover to lay canister into position. Snap canister into place. Pull and discard red tab to activate batteries.