Class 10 is the better card as it allows for full HD recording where class 4 only goes up to 720p... The other benefit with class 10 cards is much faster read and write speeds!
Not true, total myth when it comes to dash cams
Taken from manual:
Manual here - http://www.mytempfil...obiusManual.pdf
Generally speaking you may use any micro SD, micro SDHC or Micro SDXC card with a capacity of up to 64GB with this camera. Larger cards are most likely also supported but not yet available. To avoid card compatibility problems, always use quality cards with a speed rating of Class 4. There are known problems with a few cards that have a higher class rating, for example some, but not all, Sandisk 32GB Ultra (class 10) will not work properly with earlier firmware versions. You should use firmware v1.17 or above with these cards. For the best compatibility use cards with a class 4 rating if you have them. There is absolutely no advantage in using cards with a higher rating. The most compatible cards are genuine Kingston.
The camera supports cards formatted with FAT, FAT32 or exFAT. Due to technical reasons, you cannot update the firmware if your card is formatted as exFAT. When using the In-Camera formatting routine (see below) cards with a capacity greater than 32GB will be formatted with exFAT. All other cards will be formatted as FAT/FAT32. Older operating systems, for example XP 64-Bit and Windows 2003, do not support exFAT file systems unless you install additional drivers. A list of exFAT drivers can be found at http://search.micros...spx?q=KB955704.
There are a few programs available, for example guiformat, that are capable of formatting large capacity cards with FAT32. This is not recommended and may void your card's warranty.
►You should always use cards from well known brands. Low quality and no-
name cards, as well as some class 2 (or less) cards, may draw more than 20mA current than quality cards. This can result in unwanted electrical noise such as clicks, chirps, hum and buzzing in the audio recording