Amazon.com - iRobot Roomba i7+ (7550) Robot Vacuum with Automatic Dirt Disposal - Empties Itself for up to 60 days, Wi-Fi Connected, Smart Mapping, Works with Alexa, Ideal for Pet Hair, Carpets,
Roomba i3 vs i7 - What They Don't Tell You
New Roomba i7+ Has Persistent Maps, Selective Room Cleaning, and Automatic Dirt Disposal - IEEE Spectrum