It is a retractable plug design to provide built-in 4 international adapters including EU, UK, US & AU. It can allow users to travel more than 150 countries around the world. It supports all AC plugs*, including MacBook Pro & Switch original charger. It can be used as a universal adaptor. With 1 Type C port and 4 USB ports. With smart charging technology, it automatically detects device's specification and optimizes charging current. If the current overloads, the fuse will automatically cut off to ensure the safety of users and appliances.