PERSONAL HELPER: The LawnBott, a battery-operated robot, does exactly what its name implies: It mows your lawn so you don't have to. Moving freely, aided by its internal computer, it follows the signal from its perimeter cable, which transmits which areas need to be mowed. The LawnBott comes in four models, offering a variety of features ranging from rain sensors (basic to all models) to Bluetooth capability (in the high-end LB3500 version), allowing it to be programmed and controlled from any Bluetooth-compatible device. Prices are $1,749 for the LB2000 Professional model, $2,299 for the LB300 Deluxe LT, $2,499 for the LB3200 Evolution and $2,899 for the LB3500.