Denso BHT-1306BWB User Manual page 42

BHT-1300B Series
3.
Remove the microSD card from its slot card cover.
Remove the microSD card directly from the slot along its lines.
 Point 
Do not pull the card too hard when removing the card. The microSD card or its card cover
may be broken if excessive strength is applied.
4.
Close the microSD card cover in the direction (1) and slide it in the LOCK direciton (2) to lock
the card cover.
5.
Install the battery cartridge.
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microSD card
microSD card cover
①
②