FEATURES BL-8188-8M WiFi wireless module with Realtek RTL8188CUS chip 4GB Flash for A13-SOM-WIFI-4GB version USB-OTG with mini USB connector LCD_CON header, compatible with the 4.3" and 7" Olimex-made displays Support for the peripherals in the official A13-SOM Debian and Android releases Power management DCDC GPIO on 0.1" step holes Built-in PCB antenna Dimensions: (2.4 x 1.3)" ~ (6.1 x 4.8)cm