Since I just received this and have not had an opportunity (thankfully) to have to use it, it is something that is difficult to review. It appears to be very simple to use, and it's already on my key chain. I also bought one for my daughter and am thinking of doing the same for my other female relatives. Our safety and protection is too important to not take necessary precautions when we are out. I also feel better just having it in the house should the need ever arise with an intruder!