Luckily for me, I have not needed to use it yet, but I have tested it, and I'm completely happy with how loud it is and how brightly it lights up.
I have had very bad experiences in the past, and so I am feeling just that bit more secure having my birdie with me at all times.
I got one for my daughter and I feel better knowing that she has one too!!
I recommend that all women should carry one of these. It just might save you from the worst experience of your life!!