1, DAC audio output, requires external power amplifier, and WT588D want to set as the DAC output mode 2, PWM audio output to directly drive small speakers speaker 0.5W8 Europe and WT588D want to set as PWM output mode; 3, pin VCC GND VREST CS CLK DO DI downloaded online output line interfaces; 4, RESET Reset button (when there is connection is interrupted or an error in the connection process, and after the download is complete, you can click here button reset); 5, the test button, ten keys K1, K2, K3, K4, K5, K6, K7, K8, K9, K10 correspond to I / O port P00, P01, P02, P03, P04, P05, P06, P07, P10, P11; 6, pin RESET P00 P01 P02 P03 I / O port pin-out, with the program for debugging microcontroller 7, BUSY busy signal indicator 8, the power indicator 10, USB cable input slot, connected to the computer via a USB cable, after turning on the power supplied by the USB. 11, locking the seat can be placed WT588D module, WT588D plug SPI-Flash (need to convert seat), by the end of placement. Package includes: 1PCS WT588D USB Audio Burner Voice Programmer Downloader VoiceChip WT588D-16P 28P