OVERVIEW: OKP K4 Robot Vacuum Cleaner [Small body design] Are the hidden corners at home not cleaned? Can't clean the underside of your furniture? OKP K4 vacuum cleaner solves these troubles for you. The 3.14in small vacuum cleaner's ultra-thin design can better complete invisible areas of the home cleaning tasks. [Long Runtime&Self Charging] Robot vacuum cleaner up to 150Mins runtime, and 1500-2000 square feet of cleaning area. When the self vacuum cleaner robot is low on power, it will return...