What does the training mask do? 
It mimics altitude training and restricts breathing. There is a lot of back and forth whether they work or not. I can tell you, Ive used them and one thing it does do for sure is help you learn to relax and focus on slowing your breathe. Hope this helps.
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Leigh - I don't want to shit on anyone's business but it doesn't mimic altitude training. It may have other benefits
That's correct. Training masks increase the resistance when breathing, it's going to improve the strength of your diaphragm by making it harder to pull and push air (the bas o2 trainer is different as there is less resistancfe when breathing out, masks typically make it harder to breath in and out). In high altitude there isn't extra resistance when breathing, you can still take in the same amount of air per breath, but each breath will have less oxygen, this is basically what causes the body to adapt during high altitude living or training, you become more efficient at using less oxygen.