This is junk, do yourself a favor and buy the one that costs $18 because it is much higher quality. I've gone through 2 of these things, the first one when I tried to insert the battery the connections where the batteries give the device power came out and were deformed in such a way I couldn't put them back in the battery compartment, so I sent it back and ordered another one. The 2nd one seemed to work for like 1 fly, after that it was simply a plastic fly swatter, even when I pressed the button, heard the little sound it makes and tried to kill a fly, it wouldn't kill the fly, nothing would happen. Multipe times I was able to trap the fly underneath the device and despite pushing the button the fly actually flew THROUGH the wholes not getting zapped once. I am done returning this, not once did I receive one that didn't properly work but twice.