Your time outside should be pleasant and relaxing, not spent swatting annoying insects away. With Ortho Home Defense Perimeter Protection Repellent Candles, you can establish a protective perimeter to effectively repel 2 times more mosquitoes than citronella, giving you and your family a more enjoyable outdoor experience. Together, the two 4. 5-oz. candles offer up to 40 hours of burn time for continued mosquito protection. The outdoor mosquito repellent candles are made with essential oils that create a mellow, fresh citrus scent, so it's pleasant to sit outside. For best results, light a candle 15-20 minutes before entering an area.