Reduce the growth of bacteria and virus. Clean by use of w400 everyday to get rid of virus mopping to keep home cleaning without virus, harsh with stain, gentle with floor. Suitable for various room, for example kitchen, living room or bath room. Apply to 3 kinds of floor. No matter you have hard floor or wood floor in your house, it can be your house helper. The all new tidal powercleaning system clean stubborn stains thorougly whileprotecting the floor. Separated compartments for clean and dirty water with individual inlet and outlet ensure cleaning efficiency. Anti-collission 9 sets of OBS decetors in the front part of the robot detect and locate obstacles, prewenting w400 from crashing into them. Anti-fall, 3 sets of detectors on the base of the robot prevent W400 from falling downsteps or from height. Voice prompt, 16 kinds of voice prompt , you can know working status of the machine anytime.