... SD card, 2GB max, to store DAT files-display effects programmed, The number of DAT files can reach ... 3. It has a two-bit 7-segment display, which can show the speed, clock frequency, DAT file number ... wirelessly.3. LED BUILD—Installed on computer, program display effects of lights, transfer data to SD card. ... card, 2GB max, to store DAT files-display effects programmed;6. With software, customer can make ...