Function: Using silver electrolytic technology, the clean tank contains a certain concentration of silver ions, which can sterilize the floor when cleaning the floor, and the sterilization rate can reach 99.9%. Color: black Material: plastic Package Contents: 2 silver ion modules Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.