"FIRST EVER OF ITS KIND" REFERS TO THE ECOVACS X8 FAMILY OF PRODUCTS. THESE PRODUCTS INTRODUCE THE "CONSTANT-PRESSURE" AND "WATER RENEWAL MOPPING" CLEANING FUNCTIONS, MAKING THEM A FIRST AMONG ALL ECOVACS PRODUCT SERIES WORLDWIDE. THIS DESCRIPTION IS BASED ON ECOVACS' INTERNAL PRODUCT INNOVATION AND DOES NOT COMPARE TO OTHER SIMILAR PRODUCTS ON THE MARKET.