I own the BT-7, by Sota Instruments. I've had mixed results with it, but I'm starting to use it pretty regularly and it has had a definate effect on my anxiety and depression. The FDA has approved them for certain conditions including Depression, Anxiety and pain relief. Supposedly the lead singer of "The Who" quit all drugs permanently via CES treatment. If you are interested in the legit device, you can look it up at
www.alpha-stim.com
Best of luck
Chris