1. Function: to replace people hanging aloft cleaning the curtain wall, solving the safety problems in high-risky industries.
2. Object: curtain walls made of glass, aluminium sheet, stone slab, hidden frame, exposed frame.
3. Speed: ≥100㎡ per hour, efficiency exceeding two spider-men.
4. Effect:  very clean, no dirty marks and waterlogging after pressed and rubbed by tissue.