By the way, I've got another little EDC wonder of eBay:
http://www.ebay.com/itm/121876066748 In short, it's a blue tooth (BT) tag, connecting to your android phone. The software
iTracing is really immature, but I'm using it with the community made version (
iTracing2 instead to integrate with the Tasker app, which I'm using for every phone automation ideas. It allows:
1. Use the tag as a wireless button (camera shutter, register your GPS fix, launch an app, turn on a siren, etc). It supports single and double click events, as well as the long click, which turns the tag on and off.
2. Use the tag as a remote noise maker (search for your keys in the room by pressing a button on the phone, so the tag attached to your keys starts beeping loud; it's also blinking with a small blue led).
3. Detect if the tag is out of range or how far it is from your phone. Basically it just monitors the BT signal strength and you can set an event on a certain % of that signal, to replicate a sort of "geo fence" feature, like "turn on the alarm if the tag, attached to your bag is out of range", so you don't forget it in the bus or on a bench. In conjunction with the GPS on your phone, the smart enough app will associate the last location the tag was visible with the BT radio low signal, so you can see that last location on the map if you've missed the alarm by accident (or had to keep the volume down for a reason).
Nice toy to play with for under $2 shipped. Some smart aces are selling the same for $20 and deleting my sarcastic comments on their web pages
I can easily see it rigged for the wire perimeter alarm triggering in the camp as its range is around 75'.