#1: Bridge between 12-position screw terminal and 2x7 connector
#2: ESD protection components
#3: 2 x 7 connectors.
#4: GPIOs (SPI), UART, external LED, COLD_RST_L, 3.3v/5v/raw
#5: Power Port
#6: LEDs (WiFi, Heart Break, LAN, SYS, PWR)
#7: 8M Flash + 16M SDRAM
#8: RST
#9: Daughter Board footprint
#10: Ethernet Port
more detail please refer Dragino wiki