While we've seen (and reviewed) a few Bluetooth proximity alarms in our day, these guys are still pretty a much a niche product. The premise is pretty straightforward: paired with your handset, the device emits a shrill alarm on the event that the two are separated. Of course, this depends on you keeping the thing on your person, and not in the backpack or laptop bag in which your phone resides -- something that's presumably more likely to occur with the credit card-sized Blue Watchdog by Secu4
