I just watched a fly circle this thing several times & then fly off unharmed.  One even flew inside the grating, buzzed around for a while and never got zapped.  In frustration I got up and shook the thing while a fly was investigating and managed to get it that way.  In 4 hours it's killed 1 housefly and no smaller flying insects at all.  My nerdie cousin attracts more babes than this does bugs.  The cord is ridiculously short, especially for something that claims to need to be 25' away from the action.  How is there going to be an available electrical outlet out in nowhere like that?  I'm  going to give it one more day and a new location & then it gets returned.
Note:  I had this setting on a table.  I got out a grate and set it up on that and it has zapped a couple of flies now.  Maybe it needs to have the bottom exposed to work.  I'll try hanging it up by its hook and check back with a report.

Hanging doesn't help.  You'd do better trying to hang the flies.  This is pretty much useless for bug control.
I just watched a fly circle this thing several times & then fly off unharmed. One even flew inside the grating, buzzed around for a while and never got zapped. In frustration I got up and shook the thing while a fly was investigating and managed to get it that way. In 4 hours it's killed 1 housefly and no smaller flying insects at all. My nerdie cousin attracts more babes than this does bugs. The cord is ridiculously short, especially for something that claims to need to be 25' away from the action. How is there going to be an available electrical outlet out in nowhere like that? I'm  going to give it one more day and a new location & then it gets returned. Note:  I had this setting on a table. I got out a grate and set it up on that and it has zapped a couple of flies now. Maybe it needs to have the bottom exposed to work. I'll try hanging it up by its hook and check back with a report. Hanging doesn't help. You'd do better trying to hang the flies. This is pretty much useless for bug control.