With all the recent talk of rapes and assaults on women why on earth all women and girls dont carry a "personal alarm" defies belief. There is no way I would be walking alone at night "anywhere" but if I was in the situation where I had to do so I would have one of these hanging around my neck with my finger ready and waiting to activate it.
In the town where I live there was an incident where a young lady had her car break down on a highway. A man stopped to supposedly help but attempted to rape her instead.
Fortunately she had a "personal alarm" hanging off her keychain which was in the ignition and she managed to reach across and activate. He got such a shock when the piercing screech went off he jumped out of her car into his own and sped off.
The noise of one of these things is very ear piercing and there is no way I would want to be around one when it is going off and it is enough to scare them and perhaps bring others to your aid.
The cost is just under $10 and they are available at many outlets.