Off! Clip-on Mosquito Repellent with 4 Refills (Mosquito Protection You Don&#39;t Spray On) Mosquito protection you don't spray on! Head to toe protection for up to 12 hours. Contains: 1 repellent fan unit, 4 refills, 2 AA batteries. Great for backyard, gardening, watching sports, at the beach, camping, at the park.