Getting difficult to find a 4gb micro SD card, any suggestions?
Only to replace existing micro card with the correct card.You can grab a samsung evo 32gig for $12.
Is there a reason you want a 4gb model?
So, you can put a larger capacity card in without hurting the scanner?https://www.amazon.com/dp/B01HU3Q6F2
If you have Replay active, a larger card spreads out the wear on the card so it lasts longer.
They are compatible.Only to replace existing micro card with the correct card.