Arduino IO expansion board

Arduino IO Expansion ShieldFeatures3-pin & 4-pin sensor interfaces, supports connecting sensors directly without complicate custom connectionsXBee module connectorWIFI-LPT100 wireless module connectorWhat's on BoardXBee module connectorIIC interfaceSPI interface3-pin sensor interfaceVCC : power positiveGND : groundD : digital pin, correspond to the Arduino boardWIFI-LPT100 connector4-pin sensor interfaceVCC : power positiveGND : groundA : analog pin, correspond to the Arduino boardD : digital pin, correspond to the Arduino boardVCC configuration : for selecting sensor interfaces power voltageDebugging/Communication selection jumperwhen connecting TXD and TX, RXD and RX respectively, the Arduino board may debug/config the XBee module or WIFI-LPT100 through serial portwhen connecting TXD and RX, RXD and TX respectively, the Arduino board may communicate with the XBee module or WIFI-LPT100 through serial portPower indicatorWIFI-LPT100 state indicatorXBee module state indicatorWIFI-LPT100 RELOAD button : for restoring to factory settingXBee module and WIFI-LPT100 RESET buttonXBee module EASYLINK buttonWeight:0.02 kgPackage ListIO Expansion Shield x 1