... , USB Device Interface 3 way 232, 3-way TTL serial port; 4,100 M network interface 6, TV and CVBS output interface; 7 ... , SD card interface 8, RTC rechargeable battery; 9,5 V power input 10,10 ... .5W speaker interfaces; 15, IIC ADC SPI Interface 16,10-bit code switch BOOT Stubbs; 17, SIM300 GPRS module interface 18, SIRFIII ...