Dock/ Headphone/microphone combo jackSim Card SlotUSB Type-C Thunderbolt | USB Type-C ThunderboltSmartCard readerSD card readerHeadphone/microphone combo jackKensington security slotSim Card Slot | Microphone/Headphone / DockSim Card SlotUSB Type-C | Sim Card SlotDocking StationHeadphone/microphone combo jackButtons for volume up and down |