I haven't used it in ages because I couldn't find the tips. So I found them, bought some N20 and now I can't figure out how to charge it. I think it's a Mosa? I'm not sure though as it was a gift and I've had it for a good 10 years. There is no branding on it, just the capacity on the bottom. It's aluminum and it has a hex shaped metal piece surrounding where the charge hole is. I found the little bag with the tips and there is a blue plastic cup type thing which perfectly fits the N20 cartridge. Trying to press it in isn't working. Maybe I'm not strong enough. I don't know, the new ones screw on and I see no way for this to screw in.