The Secu4 Blue Watchdog may be one of the most valuable gadgets that you don't yet own. This device can be programmed to sound an alarm when it gets between a distance of one to thirty meters from your cell phone. When the Blue Watchdog goes beyond your programmed range limit your phone will be notified and the alarm will sound.
A device like this would prevent would-be bag snatchers and kidnappers from getting away cleanly. The alarm on the Blue Watchdog rings at 100 decibels which should any thief in their tracks. Check out the links and watch the video to see more.