Avenger Dirt Devil Robotic In Ground Pool Vacuum with Nylon Rollers On-board Dirt Devil computer calculates your pool parameters using state-of-the-art Digital Signal Processing (DPS) to optimize cleaning based upon pool size and shape. Filter bag full sensor immediately senses when the bag needs cleaning. Protective cushions make cleaning the filter bag a snap! EZ Clean disposable filter bags capture debris as small as 2 microns. Two cleaning cycles are the perect way to save energy costs in smaller pools & the vacuum works independently of your pool pump and filter. Cord length of 55'. Nylon rollers gently brush and scrub gunite and vinyl pool surfaces as the Avenger works its way around your pool.