This is the trap that attracts and kills mosquitoes across a half-acre without harmful chemicals. It emits carbon dioxide (the same gas people expel during respiration) that is generated when ultraviolet rays from the internal fluorescent bulbs react with a titanium dioxide coating inside the trap. When the mosquitoes are drawn inside the device, an integrated fan traps the insects and sends them to a removable compartment where they die of dehydration. Unlike propane systems that require frequent refills or electrocution traps that release pathogens when an insect is killed, this CO2 mosquito trap uses 3,000-hour rated UV bulbs and does not create harmful biological agents. In addition to mosquitoes, it catches flies, moths, no-see-ums, beetles, wasps, yellow jackets, gnats, and biting midges. AC plug. 11 1/4" H x 8 1/2" Diam. (2 1/2 lbs.)