I sometimes work at a place where the route from the parking is poorly lit and a bit dodgy. So, with the nights getting darker earlier, I was thinking about getting a personal alarm. Spotted this while I was out and about and thought it seemed pretty good value. It comes with batteries (3xag13), a small led light, and the alarm is rated at about 100dB. It has a pull-pin type mechanism to set the alarm off.
Pretty useful for a few things, like accidents or falls etc, not just as an 'attack' alarm.