Pest A Cator Mosquito Free Electronic Mosquito Trap. Designed to emit CO2, Heat, and Moisture to lure mosquitoes to the trap. Easy to use and easy to clean. Great for both indoor and outdoor use (not a propane unit). This trap is an electronic device that utilizes multiple attractant technology in an attempt to offer you one possible alternative to potentially harmful chemicals in helping to control mosquitoes. Mosquitoes, in general, have been shown to be attracted to carbon dioxide, heat, and moisture emissions from humans. This device utilizes these factors by using vinegar and baking soda to create CO2 and moisture, while a heating element in the unit creates heat to further simulate a human presence. When the mosquitoes are drawn to the unit, a fan pulls them into a catch chamber where they are collected and dehydrated. This product has been approved for retail sale in every state except New Mexico. Note: As with any pest management technique, no one method is completely effective, and a program of integrated management involving a variety of techniques and practices is most likely to provide the desired results.