How to choose the right memory card for your device:
01Real compacity does not equal to marked compacity. The factory mark the compacity as this: 1MB=1000KB, 1GB=1000MB, but the oparating system such as compiter show the compacity as binary arithmetic: 1MB=1024KB, 1GB=1024MB.
SO there is some difference between the real compacity and marked compacity: 8GB=7.45058GB  16GB=14.6012GB  32GB=29.10232GB 64GB=59.0464GB 128GB=119.206GB
02Speed of the card: the tachograph 1080P HD usually wright into 200MB\/m data, the video may be dropped frame if the speed is too low to wrightten,so the tachograph always need a class10 high speed memory card
03About the fomat of the memory card: generally, oparating system default the minmum compacity of file system not allow over 4GB

Specification:

Brand: Microflash
Model: Tachograph Version
Speed: C10 Class10
Compacity:16GB
Read Speed: 70mb\/s 
Size: 15*11*1 mm
Working temperature:-25\u2103-80\u2103

Package include:

1X Microflash tachograph version memory card