Serial Port / Headphone/microphone combo jack | Card Reader: SD, 1 SmartCard | SD card readerHeadphone/microphone combo jackKensington security slotUSB Type-C Thunderbolt | Microphone/Headphone / DockUSB Type-C ThunderboltSecurity lock | SmartCard readerHeadphone/microphone combo jackKensington security slotUSB Type-C Thunderbolt |