User manual iRobot Roomba 521 (English - 19 pages)
iRobot Roomba 521 specifications
Green Cell® Battery for iRobot Roomba 521 531 555 563 Pet 564 Pet 565 Pet 581 605 610 Professional (Ni-MH cells 3000mAh 14.4V) : Amazon.co.uk: Home & Kitchen
iRobot Roomba 521 - Coolblue - Voor 23.59u, morgen in huis