The Repel Insect Repellent Triple Wick Citronella Candle, Green repels mosquitoes and other flying insects from your outdoor areas. Made with real citronella oil, this triple-wick, 20-ounce candle burns up to 40 hours, making it ideal for use while you spend time outdoors on your patio, porch or deck or at a campsite. To reduce the annoyance of mosquitoes, use one or more candles in still air. To maximize the repellent barrier, use several candles to create a perimeter of protection against flying insects – best results within 3 feet. Place the candles at least 18 inches apart on a heat-resistant surface away from anything flammable and out of reach of children or pets.