Cool Add-Ons and Accessories

Most of the price differences from Roomba model to another are based on the features and options you want to include with your purchase. In another refreshing bit of clear thinking, iRobot has made most of the accessories compatible with all existing models of Roomba. You'll definitely want a Home Base for hassle-free recharging; fortunately, most models come complete with this feature, which can recharge your Roomba's batteries in just three hours. Or how about a remote control, so you can turn your Roomba on and off from a distance?  All models have remote control ability, and the top models -- Scheduler and Discovery SE -- can even be programmed remotely, using the iRobot Scheduler.

Another nifty feature is the Virtual Wall, a snazzy infrared emitter that stops Roomba in its tracks. Think of it as a high-tech baby gate for a robot: just like a real wall, Roomba can't get past it. Virtual Walls are great for rooms with open doorways, because you don't want the robot to just take off down the hall and try to clean every room it can reach. This might not be such a bad idea for a small apartment, but if you've got a decent-sized house, it's unlikely its battery would hold out long enough. Besides, you don't want your Roomba running wild and overeating, do you?

Perhaps most surprising, these gadgets aren't that expensive, and are packaged with many models anyway. But if two or three virtual walls aren't enough, you can always get another one for $29.99. If you wear out the remote, a new one costs a mere $19.99. These reasonable prices extend to the necessities as well. Besides geek toys like remotes and Virtual Walls, iRobot offers a full range of filters, cams, batteries, brushes, chargers, cleaning tools, and other items you need to keep your robot in good health. For example, a six-pack of air filters will cost you $27.99; similarly, four-packs of brushes will set you back about $25. Considering that these are major parts for a home robot, that's not too bad at all. Imagine how expensive buying parts for Rosie the Robot would be.

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