If you're a Transformers fan, I present theRoomba Combo J7+ . This robot vacuum and mop combination easily transitions from hard to soft floors by lifting the mop away from carpets with a retractable arm.

The Combo J7+ is a self-emptying robot vacuum that is also smart enough to avoid obstacles on the floor, from dirty socks to pet waste -- and you can nowbuy it now for$799 (down from the usual price of$1,099).

iRobot Roomba J7+

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The Roomba's dual multisurface rubber brushes effectively pick up small debris, dust, and hair that other robot vacuums can miss. The rubber brushes have no bristles, which helps prevent hair tangles and ensures more consistent suction, making it a great fit for homes with kids and pets. 

Review: Roomba Combo J7+: A 2-in-1 robot vacuum done (almost) right

The J7+'s small mopping pad and water tank make it more suitable for medium homes or mostly carpeted areas, as larger areas require refilling the water tank several times during a cleaning session. That being said, we can't knock its mopping performance. This Roomba features SmartScrub, a technology that mops back and forth with downward pressure to get rid of tough stains. 

The Roomba Combo J7+  is$300 off, available for$799 for a limited time. 

Amazon

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