It's clear that this pedal is an Electro Harmonix bass balls clone. And a good one at that! It sounds practically the same. The sensitivity knob does what the one on the bass balls does and the switch adds the same kind of fuzzy distortion the bass balls can give you.
and it doesn't stop there. with the Bass Balls you have to op up the pedal to be able to adjust the two filters. Not with the sweeper! The good people at Mooer have put to little knobs on there to adjust these filters without having to open up the pedal, which is a nice extra.
So, if you're thinking about buying a Bass Balls, look into the sweeper. It takes up a lot less space on your pedalboard, sounds the same and has the filter knobs in reach. I own both (bass balls & sweeper), but it's the sweeper that's permanently on my board.