Gotta say, pretty disappointed with this zapper. It definitely does not live up to its namesake or match a lot of the other reviews. I put brand new high quality batteries in and when I first tested it found that it only stuns flies for about 10 seconds. If you don’t find that fly within 15 seconds, it gets up and starts flying around again! The racket does make a satisfying ‘snap’ to let you know you have hit the fly, but that’s it. Smoke and mirrors. Way too pricey for the performance it gives.