2 refills included. Each refill diffuses a blend of natural essential oils for up to 15 days. A single refill pellet fits safe and snug in the mesh pocket on the outside of the Wristband & Clip. As the natural oils' active ingredients are released into the air around you, they help to mask the scents of your breath and body, making it harder for mosquitoes to find you. Super simple, super effective!Kids wristband total Length: 8 inches. MAX. Circumference: 6 5/7 inches. MIN. Circumference: 5 5/7 inches. Directions for use: 1. Insert the pellet into the Kids Wristband 2. Wear it on your wrist/ankle or keep it nearby.