4 Things to Know About the Xiaomi S40 Pro’s 4000Pa Suction

4000Pa suction is a real upgrade over 2500Pa The S40 Pro pulls embedded dirt and pet hair out of medium-pile carpets in a way the H40 cannot match.

The difference matters most on carpets On hard floors, the H40’s suction is adequate. The S40 Pro only justifies its cost if you have area rugs or carpeted rooms.

It deep-cleans rather than surface-cleans The extra power digs into carpet fibers, not just the top layer, so you get a more thorough clean.

Skip the S40 Pro if you have only hard floors You will not notice the suction difference on tile or wood, and the H40 will save you money.