BUYER BEWARE: It appears Flowtron currently has quality issues with the starter bulb that starts the fluorescent tube in the most recent units.  Bought three of these from two different sources in March 2011, one source being Amazon.  Within one week, one unit from Amazon and one from another source had quit working, leaving only one of three working after a week.  The bulb simply stops lighting and that causes the grid to not energize too, rendering the zapper useless.  The third went in about 4 more weeks so after a month and a half, my small sample of three has a 100% failure rate.  Flowtron sent me some starter bulbs (a $2.50 part) and that DID fix the problem.  I'm hoping that the fix will last as replacing the starter bulbs on a new unit is a nuisance and some people might not be comfortable with the repair.  When these work though, they attract/kill more bugs (and many mosquitoes) than any other electronic insect killer I've used.  And I've tried three different brands.