A 20 lb. tank lasts about 3 months. The ones that we had did not need the lure. They do require 110 VAC. We used them in N.H. for 3 seasons with no problem and will ship the two down with our next container.
The one that we did have here in the D.R. lasted about 2 years, 24hours a day until the salt air ate it up. (we are on the ocean) I still have it in my garage and will rebuild it when I can find the parts. Being an older one, parts are not available from the company.
It got about 5 tablespoons in the first 24 hours. The link has information that can tell you about how many that is... about 5,000 mosquitos?
little plastic contraption about the size of a gallon jug that uses pheromones to attract the moskies which then get trapped and die. You use water that normally would breed mosquitos to 'bait the trap' with the pheromones.
Sorry I don't have a link. Bought mine from an organic garden supply store in Canada, however it does keep my apartment moskie free!