Oleg wrote, "does it support 4gb sd cards ?"
No, the unit is too small for standard Secure Digital cards.
Zaxcom employs the Mini-SD card, which is about half
the size of the (already small) SD.
The largest capacity for a Mini-SD card today is 2GB,
Sandisk, AData, Pretec, and Simpletech make them.
Best price today is about $75 for 2GB.
Flintstone