what's the difference between "pet" model and other models ( e.g. romba581, I bought from costco in April and it works great! )? thx
-bentley(小兔);
2013-6-4(#8230689@0)
Thanks for the info. It seems this model is still in a good and stable condition.
-efsuca(梧桐早凋);
2013-6-4(#8231012@0)