Don't bother with it.
I have one I got for my cat, and the motor burned out on it after only 6 months. And yes, they're noisy. Things sound like a buzz saw in need of serious oiling. The containers on them are horridly expensive and have to be changed out almost every day. They don't even lock out oder that well. That's more the function of the litter you use.
Right now, the one I have is being used as a regular litter box.