Robustel GoRugged R3000-3P - Chapter 2: Installation Procedures; 2.3 SIM and Micro SD Card Installation

Robustel GoRugged R3000-3P User Guide
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Or to mount the router on a DIN rail, you need three pcs of M3 screws.
2.3 Install the SIM Card and Micro SD Card
 Inserting SIM Card or Micro SD Card
1. Make sure power supply is disconnected.
2. Use a screwdriver to unscrew the screw on the cover, and then remove the cover, you could find the SIM Card
slots and the Micro SD slot.
3. Insert the SIM card or Micro SD card, and you need press the card with your fingers until you hear “a cracking
sound”. Then use a screwdriver to screw the cover.