idp SMART Series User Manual page 8

⑩ WiFi dongle module (Optional)
⑪ Cover cap 1 (NOT used)
⑫ Cover cap 2 (NOT used)
⑫
⑩
⑪
Figure 3 SMART-21P rear features
＊Caution
The 2 ports which are covered with a cap can't be used, so don't remove a cap.
SMART-21P is a portable printer with a sealed packing case.
Figure 4 SMART-21P PACKING accessories