It's not the first robotic lawnmower to hit the U.S. market, but Miimo is the first one for Honda. Available in two models to tackle different lawn sizes, the HRM 310 is capable of cutting up to a half acre, and the HRM 520 with a larger battery can cut up to 0.75 acres. Both mowers are equipped with high-traction wheels, a heat-treated pivoting steel blade that spins clockwise and counter-clockwise for longer life, and an anti-theft alarm.