Lenovo ThinkPad X1 Tablet Gen 3 User Manual page 16

9 Right stereo speaker
10 Power button
11 Volume-control buttons
12 Pen holder slot
13 Pogo interface connector
14 Audio connector
15 Mini security-lock slot
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16 USB-C™ connectors (Thunderbolt™ 3 compatible)
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17 Nano-SIM-card and microSD card slot
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