Features: This silver module accessory is precisely designed for M40S Robot. It fits perfectly into previous water tanks systems, ensuring stable performances and stable operate without affecting normal cleaning modes or suction power. Make from Plastic, this silver module ensures long term stable output and stable purification performances. It helps purifies and clean stain in water, reduces scale buildup in tanks, and is widely suitable for household daily use to maintain a healthier cleaning environment. The silver module continuously releases active silver ions into the water, helping to purifies dust and fine particles in the water flows. Easy to Install: The silver module is designed for quick installation and replacement, allowing users to easily complete maintenance at home. Specifications: Component: Plastic Quantity: 1pc/2pcs Size: as shown in the picture Applicable models: Suitable for M40S Package Includes: 1/2pcs Silver ions Module note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.