A number of additional features can make your vacuum robot even handier around the home. For example, certain robots
offer automatic docking and recharging features. When their batteries run low, the machines return to their home base
to get more energy which means your robot can both clean and recharge itself when you are gone. You set it up to clean
and the vacuum will also recharge and be ready to go the next time you need it.
Many cleaners come with features to keep them from going places they should not, like virtual walls that emit a signal that
the cleaners will not cross. Boundary markers, which are simple strips of rubber-like material or plastic, accomplish the
same goal when you place them on the floor. Once the cleaner’s sensors detect the markers, the robot should change
direction. Another feature, called a cliff sensor, prevents robot vacuums from falling over drop-offs such as stairs.
It is important to find a robotic vacuum that provides good air filtration, since there is no point in having a machine
vacuum up dust only to spray it all over the place as the machine moves. Some of the best robot vacuums have two levels
of air filtration, and it is especially good to have one equipped with a HEPA filter. HEPA (high-efficiency particlate air) filters meet the U.S. Department of Energy efficiency standards and are great for removing allergens.