The answer to this question is model and software version specific. SDHC is compatible with all APEX. HELIX, ONIX, ION, SOLIX, 300, 500, 600, 700, 800, 900 and1100 Series products with color displays at software version 3.7x0 or higher. On monochrome 700 series you would need version 3.8x0 and higher. Older versions of software or older products will not be compatible.
The highest card capacity we support is 32GB.
If you have a larger card and are comfortable re-formatting a card, you can format it to FAT32 and use it in our units.