Triple threat defense

Now here’s a product I can get behind.
The Trident triple action personal attack alarm is pretty bad-ass. This tiny alarm sends out a 138 decibel alarm blast, combined with cloud of very nasty smelling something or other and an invisible tracer cloud. The tracer cloud sticks to the attacker’s skin and can seen under ultra violet light for up to seven days. Wow.
I think this kind of alarm is better than your average pepper spray that could potentially used against you. Any thoughts on personal safety devices? Recommendations?
Via Travelizmo.
Note: While the alarm seems to be out of stock from the place Travelizmo found it, a Google search reveals plenty of other places to purchase.