1. The charging contact of the Robot Vacuum Cleaner S1 Plus is on the side while it is on the bottom for S1.
2. S1 Plus detach the Dust bin & Water tank set in the horizontal way, while it is vertically for the S1.
3. Only the S1 Plus has charging electrodes on the Dust bin & Water tank set.
4. The Water Tank is 300ml for S1 Plus, while it is 340ml for S1.
5. The Dust Bin is 350ml for S1 Plus, while it is 360ml for S1.
6. The battery capacity is 5000mAH for S1 Plus, which can run for 3 hours under quiet mode; the battery capacity is 3200mAH for S1, which can run for 2 hours under quiet mode.
For further inquiry, please submit a feedback request on the profile page of the app or contact firstname.lastname@example.org.