The Thermacell Tick Control Tubes are an effective, easy way to control the deer tick population. It is a no-spray formula that contains permethrin, which affects the insect's nervous system upon contact or ingestion. It also protects your pets and family members from Lyme disease and the Powassan virus. Each tube is quick to set up and only needs to be applied twice a year. Mice take the permethrin-treated cotton back to their nest, and the ticks that feed on these mice then die. This product is environmentally friendly and complements spray programs. Best used outdoors in areas where mice are likely to nest, such as rock walls, woodpiles, and flower beds. The tubes are best used in the mid-Atlantic, New England, and Northern Woods areas, where Lyme disease rates and the deer tick population are highest. 6 tubes will treat up to ¼ acre. For best results, apply in late April and late July, before ticks start feeding.