- NO PATENT ISSUE WITH IROBOT - Ultrasonic anti collision technology, can detect any types of obstacles (infrared can't detect transparent obstacles and will be influenced by sunshine) - Ultrasonic auto charging technology, 40% more efficient than infrared, almost 100% auto charging rate - Ultrasonic virtual wall, rechargeable design - Ultrasonic dirt detect technology, more accurate than infrared technology - Ultrasonic full bin indicator - Water tank, wet mopping/dry mopping