1.Low noise, 2.Easy to operate. 3.Touch senstive button. 4. Latest new auto cleaning robot tech Features: • Can auto-cleaning and auto-charging (before the battery's power run out, the cleaner will search the station and charge automatically) • Charging time can be set to clean at a certain time any day /some day all days of each week • With stair avoidance sensors for avoid the cleaner falling ...