I recently came across this gadget on eBay.
It's a Bluetooth wireless remote control for smartphones (iOS & Android). Basically made for the selfie crowd, investigators will find applications for it as well. Not bad for a buck.
It comes with a battery. No instructions needed. Just flip the side switch, and pair it with your phone.
You can now be up to 30 feet away from your phone and snap photos, or take movies.
How can you go wrong for $1.00? Did I mention shipping was FREE! The catch... it will take about a month to arrive. Mine came from Thailand, probably via message in a bottle.
Need one quicker, a California ebay'er has them for $4.20, Free shipping.