“THERE ARE 2 BIO SELF EMPTY ROBOT VACUUM & MOP w. 100 DAY DAY DOCK ECT ECT ECT FOR 1129.99 . AND 1 FOR 269.99. WHAT IS THE DIFFERNCE BETWEEN THE 2. I HAVE READ UP ON BOTH AND I DO NOT SEE ANYTHING DIFFERENT EXCEPT THE PRICE. COULD SOME ONE EXPLAIN”