Matryobot (Robotic vacuum cleaner) / Robotic vacuum cleaner

A robotic vacuum cleaner is one of the useful products at home. However, since there is the height of its own the robotic vacuum cleaner, it cannot clean a small space such as under a sofa or a gap of between them. I have designed a new robotic vacuum cleaner to make up for these shortcomings of the existing robotic vacuum cleaner. I have got the idea from the form of Matryoshka doll that contained the doll inside the doll, and this new robotic vacuum cleaner product i devised has a structure containing a small robot cleaner inside the big robot cleaner.