Otodex® 7 DAY FRESH is a microcapsule technology 7 day fragrance odour barrier. It works 24/7 to neutralise bad odours and replace them with a long lasting fragrance. How does microcapsule technology work? Invisible to the human eye, microcapsules deliver long lasting fragrance when people or pets are present. The biodegradable shell, a fraction of the size of a human hair, gently emanates a subtle fragrance. As soon as the shell is broken, it ruptures and gives a burst of long lasting scent. Otodex® 7 DAY FRESH is effective against: Pet urine & faeces Food aromas General pet odours Vomit Stale smoke Chemical odours Body odour And much more!