In the old days a personal alarm was a simple whistle, now as technology has moved on personal alarms are generally electronic devices emitting ear damaging decibels. For people that like the notion of an old fashioned whistle but want the reassurance of assailant stopping decibels you can now get an electrical defence whistle.
The electrical defence whistle looks like a modern whistle that requires a bit of wind to operate. Instead of blowing though you can just hit a button to get an ear piecing siren. Comes in a choice of pink, blue or orange so you can get one to coordinate with your outfit.
Available from Future in Store.