ULTRA Mosquito Trap Kill mosquitoes, midges and more with the multi-stimuli, human-mimicking ULTRA Mosquito Trap Smart technology includes Mosquito-Attracting-Stimuli (MAS) settings which allows the ULTRA to be fine tuned to target specific mosquito species Comes fully assembled with programmable multi-function timer, the ULTRA is DIY self-serviceable with on-board diagnostics package CO2 ready (cylinder not included) the Optional CO2 Gas Attractant System can increase capture rates by up to 400%. The Ultra Trap should NEVER be operated indoors, or in any other enclosed space, when the CO2 gas release system is in use. Comes fully assembled and will begin to catch immediately there are any mosquitoes around, but may take 6-8 weeks of use to reduce populations to the point that breeding cycles are interrupted