Top of the line Mega-Catch ULTRA Mosquito Traps successfully mimic sensory signals which attract mosquitoes and other common biting insects from as far away as 150ft. Revolutionary Mosquito-Attracting-Stimuli (MAS) settings and there are literally thousands of options enables the Mega-Catch ULTRA to be fine-tuned to target specific mosquito species. While Mega-Catch Mosquito Traps need no carbon dioxide (CO2) to attract mosquitoes operation of the patented Variable Quantity Slow CO2 Gas Release System will boost capture rates. It enables the Mega-Catch ULTRA to duplicate a key feature of human/animal respiration by releasing or exhaling variable amounts of CO2 into the air plume. Use of this system is entirely optional but if you are battling a challenging mosquito problem we strongly recommend that you operate the trap with CO2 as this can increase capture rates by as much as 300-400% The Mega-Catch ULTRA mosquito trap contains all the hardware needed to connect the trap to a CO2 cylinder (not included) which can be filled at hundreds of gas supply outlets throughout North America (see operating manual for details). The trap can be further enhanced with the use of operional attractants to boost capture rates; the Mega-Catch Octenol Fragrance Strips or the Mega-Catch 3000 (Combo Lure).brEach Mega-Catch PRO 900 Series ULTRA MCU-800 package contents includes:1 x MCU-900 Mega-Catch mosquito trap incorporating multifunctional programmable timer 1 x Liquid Catch Container 1 x Standard Catch Bag 1 x External Skirt 1 x 110-240/12 Volt Weatherproof Transformer 1 x 60 foot Low-Voltage Extension Cord 1 x Optional CO2 Gas Attractant System including low pressure gas regulator and 3 foot gas cable with snaplock fittings (cylinder not included) 1 x Stand (zinc plated/powder coated) 1 x Operation Manual. Maximum range - 150 feet (45m)* and Maximum coverage - 1.5 acres (0.6 hectare)* *in optimum conditions- SKU: ENVR015