20 inch Standard suitcase for airplane: International standard suitcase for airplane, can be on board directly, no need checking. 90 degree side open,easy to takeout your belongings and save your time. External USB port: can charge your phone and table pc.The removable 62.6Wh lithium-ion battery complying with airline boarding requirements is able to charge your mobile phone, Pad and other electronics. Mode switch as you wish: One button to switch, auto-follow mode to tow mode.When using the normal tow mode ,the motor will draw up,protecting the motor and make it easy to tow the luggage Alarm System: Auto Following Smart Luggage and Your Mobile Will Release Alarm when It’s Separated from the User Beyond Safe Distance, 30L Large Capacity, Built-in Multi-country General TSA Customs Code Lock, Consignment Peace of Mind. Intelligent Obstacle Avoidance, : It Can Travel Autonomously Without Bumping into People or Objects As the Smart Sensors Can Scan and Analyze the Real-time Surrounding Info and Identify Obstacles, Suitable for Brick Road / Blind Road / Asphalt Road / Carpet / Marble Road, Etc.