The SE features include Dirt Detect, the self-charging Home Base, an extra-large debris bin, the Roomba Remote, three cleaning modes, and a Charging Wall Mount. The SE also includes the Advanced Power System which gives your Roomba the energy it needs to clean up to 4 rooms.
The Advanced Power System provides up to 120 minutes of cleaning power and recharges the battery in 3 hours – 60% faster than the original Roomba.
Buy.com has the iRobot Roomba Discovery SE for $164.99 with free shipping or $144.99 with Google checkout.
iRobot Roomba Discovery SE Vacuuming Robot Model 4220