Hello
So our threshold is 3cm 45 degree slope. That is a metal threshold. He can just about manage this.

The maximum height that can be driven over is approx. 2 cm. Spare parts can be ordered cheaply from Aliexpress. The filters are washable and can be used for a long time. The side brush can also be used for a long time. The floor brush as well. Data security is guaranteed because the camera image information is only evaluated in the robot itself. This has also been confirmed by TüV Germany. No data is sent to the outside. The live camera view can also be used if necessary, but the function is not activated.

Question 1: Mine wasn't broken yet.
Question 2: It can't do 4 cm.
Question 3: This thing is from China ... I wonder if they have a word for data protection.