I'll add to this, as a user with no mech experience, this is a great device started with thanks to its built in protections. Absolutely no risk of a battery going nuclear on you.
I've tried 2 RDA's on the Pumper sent to me and found the following:
Dead Rabbit 3, 2x 0.62 Ni80 coils, at 0.3 ohms. Nice vape from it, and works out at 52W when i tried to get the same vape on a regulated mod.
Profile, 0.13 Mesh, Instant flavour, and damn good vape. Equivalent to about 60-65w on a regulated mod.
Power is definitely being throttled, I should have experienced a lung burning inhale on the Profile with a freshly charged battery, but got the same excellent vape as everyone else.
For anyone wanting to dabble with a mech squonker for the first time, this is a great bit of kit. Of course you'll still need to ensure you are familiar with ohms law and still work within your battery limits, but at least the protections will ensure you don't hurt yourself in the process.
Thumbs up from me!