The side brush you mention is an important accessory for Xiaomi robot vacuum cleaners, helping effectively with cleaning your space. This brush is mounted on the side of the robot and is responsible for removing dust and dirt from corners and hard-to-reach areas.

Here are some features that make it essential:

• Main Brush: The main star of cleaning, designed to "beat" the fibers of carpets and lift dust from hard surfaces.
• Compatibility: Suitable for Xiaomi X10, X20, S20, and S10 models.
• Material: It may have bristles or be made of rubber/silicone, reducing tangles with pet hair.
• Manufacturer: Compatible product from a third-party manufacturer.

Upgrade your robot's performance and enjoy a cleaner space with this durable and suitable side brush.