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1. Power connector	Connect to ac power through an ac power adapter.
2. Thunderbolt ^™ 3 connectors (USB-C™)	Charge USB-C compatible devices with the output voltage and current of 5 V and 3 A. Transfer data at Thunderbolt 3 speed, up to 40 Gbps. Connect to an external display: USB-C to VGA: 1900 x 1200 pixels, 60 Hz USB-C to DP: 3840 x 2160 pixels, 60 Hz Connect to USB-C accessories to help expand your computer functionality. To purchase USB-C accessories, go to https://www.lenovo.com/accessories. Note: When the battery power is below 10%, the connected USB-C accessories might not work correctly.
3. HDMI™ connector	Connect to a compatible digital audio device or video monitor, such as an HDTV. The HDMI connector on your computer supports the HDMI 2.0 standard by default. If you connect an external display to your computer through the HDMI connector with an HDMI 1.4 cable, the external display might not work. In this case, use a qualified HDMI 2.0 cable instead of an HDMI 1.4 cable.
4. Audio connector	Connect headphones with a 3.5-mm (0.14-inch) and 4-pole plug to listen to the sound from the computer. Connect a headset with a 3.5-mm (0.14-inch) and 4-pole plug to listen to the sound from the computer or talk with others. Note: This connector does not support standalone external microphones.