I received a VIP Sample of OFF Clip on from Sample Source to try out for free. I tested it out after supper, just before dark when the bugs thicken. I went out back to pick some blueberries. Before I went outside, I loaded the cartridge. I didn't turn it on right away though. I wanted to see how active the bugs were before I turned it on.
I wasn't outside more than a couple minutes before I felt bug bites. I took that as a cue that it was time to turn the rig on. Within seconds, the bugs weren't biting me anymore. They were avoiding me all together. I didn't notice any specific scent. Aside from the tiny whirring sound that the fan was making, it barely made a sound. I was able to pick berries until dusk without being disturbed by a single bug. The only bother, were the bites from the bugs that had already bit me.
Disclaimer: I received this product from Sample Source for free in exchange for my honest opinion.