the robot vacuum cleaner auto clean,do it by themselves hands free from the housework rechargebable battery easy to use The description and feature:1 ... .4,Frequence:50/60HZ5,charge time:4hours6,working time:70mins7,power:36WFunction and Feature:1,the design have our own intelligent ... work in3,cleaning along the walls of furniture4,if the prodcuts is on the margin of a high place,it will change ...