About the boundary markers
To prevent the POWERbot from entering the following areas, attach the boundary markers on the floor in the 
shape at an interval of about 15 cm.
About 15 cm
About 5 cm Boundary
markers
where a raised spot is below 5 cm
About 15 cm
Boundary markers
where there is a slide, swing, fireplace or any flammable substance or moisture.
Above 1.5 cm
boundary 
markers
where a threshold is above 1.5 cm
Boundary markers
where there is risk of falling such as stairs, porches or guardrails.