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U can find it on the web. I too have questions about it. It costs $250 US dollars. You use small canisters of gas. I don't know how much they cost.
I have the R2D3. Purchased it in July when threads were buzzing about it, just before the failures documented here that you've read through. Took about a week to arrive from China. $250 and just under $90 shipping. No welfare checks, they sell the exact same model in their sister site to be used with oxygen as an actual rebreather. It will ship to residential. I opted to have it sent to a secure postal delivery hub for pickup. The user guide was totally revamped shortly after all of the issues posted about unclear directions and failed attempts. Thanks heavily to @jacrispy experience It's updated now on their website. I was emailed the updated user guide. You choose which inert gas you want to use. I opted for the 18g nitrogen canisters and got 4 for $120 online. I hesitate and am deciding on a backup method to have in place because of the deflation issues people went through, while I know the previous instructions weren't clear on amount of gas necessary, I feel like I have a 50/50 chance if it will work properly, and I can't fail. Hope this helps.
It seems to be very hit or miss from what I've read. I hope the updated instructions solve the issues some other users have experienced.
The gas prevents the lungs from producing CO2 buildup (which is what causes the painful feeling of suffocation) so it will not cause any pain.
