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robot vacuum cleaner with floor wash function powerful cleaning system specification: material: abs colors: black / white charge method: usb charge power: 3w voltage: 3.7v main battery of the machine: li-ion battery 1200 mah (included) initial charging time: about 8 hours normal charge time: 3h working time: 90 minutes noise: less than 55db description: gravity sensor, automatically changes direction in case of obstacle, smart to use. working time: 90 minutes it can continue to...